2. Mixed and Decimal Numbers
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Chapter 2
2.
Mixed and Decimal Numbers
This lesson focuses on four key mathematical concepts: mixed numbers, improper fractions, decimal conversion, and long division. It explains how these concepts are interconnected and can be used in various real-world situations. For example, if someone is trying to divide a pizza into equal slices but end up with a piece that is not a full slice, they can represent that piece as an improper fraction or a mixed number. Similarly, if someone is working on a budget and need to divide expenses, understanding decimal conversion can make the process much easier. Long division is also covered as a foundational skill for these conversions. The lesson aims to equip with the tools to make better decisions and solve problems in both academic and everyday settings.
Show less Show more expand_more| Student Learning Objectives: |
|---|
|
| | 15 Theory slides |
| | 9 Exercises - Grade E - A |
| | Each lesson is meant to take 1-2 classroom sessions |
Mixed and Decimal Numbers
Slide of 15
There are different ways to write and convert between rational numbers. Each is useful in different situations. This lesson will focus on exploring such number forms and converting them into each other.
Catch-Up and Review
Here are a few recommended readings before getting started with this lesson.
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Explore
A Different Way of Writing Improper Fractions
Consider two bars split into into an equal number of parts. Try to determine the fraction that the bars represent.
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Discussion
Mixed Numbers
A mixed number consists of a non-zero integer number and a proper fraction.
a bc [0.5em]
whereais an integer,b
Consider the graphic representation of different mixed numbers.
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Discussion
Converting a Mixed Number Into an Improper Fraction
Improper fractions and mixed numbers are two different ways of writing numbers that can have the same value. Consider the following mixed number. 5 29 This mixed number can be rewritten as an improper fraction in three steps.
1
Multiply the Integer Part by the Denominator
expand_more First, identify the integer part of the mixed number. This is the integer number written before the fraction.
Next, multiply the integer part by the denominator of the fraction. In this case, the denominator of the fraction is 9. 5* 9=45
2
Add the Numerator
expand_more Add the numerator of the fraction to the number from the previous step. In the given mixed number, the numerator of the fraction is 2.
45+ 2=47
This is the numerator of the improper fraction.
5 29=47/?
3
Write the Denominator
expand_more Write the numerator of the fraction part as the denominator of the improper fraction. The denominator in the fraction of the given mixed number is 9, so this is also the denominator of the improper fraction.
5 2 9=47/9
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Example
Solving the Clues
Izabella finds a note with two mixed numbers.
a
Write 4 13 as an improper fraction xy.
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b
Write 6 38 as an improper fraction zw.
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c
How many steps forward should Izabella take? How many steps left? Write each answer in list form.
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Hint
a
Multiply the integer part by the denominator of the fractional part and add the numerator to find the numerator of the improper fraction.
b
The denominator of the improper fraction is the same as the denominator of the fraction in the mixed number.
c
Identify the values of w, x, y, and z comparing the fractions.
Solution
a
The first mixed number we want to rewrite is 4 1 3. Let's multiply the integer part by the denominator of the fraction. Then, add the numerator of the fraction. The result is the numerator of the improper fraction.
The numerator of the improper fraction is 13. The denominator is the the same as it was for the fraction in the mixed number. 4 1 3=13/3
b
For the second mixed number, 6 3 8, we can follow the same process we used in Part A.
The numerator of the improper fraction is 51. The denominator is the the same as it was for the fraction in the mixed number. 6 3 8=51/8
c
Let's consider the questions one at a time.
First Question
In the note, the numerator of the first improper fraction is x and the denominator is y. Let's use our answer to Part A to find these values. x/y=13/3 This means that x= 13 and y= 3. Let's take a look at the first instruction that Izabella received. 1. Take x+ y steps forward. Let's sum x and y to find how many steps forward Izabella should take. 13+ 3=16 steps
Second Question
The numerator of the second improper fraction is z and the denominator is w. Let's use our answer to Part B to find these values. z/w=51/8 This means that z= 51 and w= 8. Now let's consider the second instruction. 2. Turn left and take z-2 w steps. We will substitute the values of z and w and evaluate the expression.
Izabella should take 35 steps after turning left.
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Discussion
Converting an Improper Fraction Into a Mixed Number
Improper fractions and mixed numbers are two different ways of writing numbers that can have the same value. Converting an improper fraction into a mixed number can help to estimate the actual value of the fraction. Consider the following improper fraction. 21/4 This improper fraction can be rewritten as a mixed number in three steps.
1
Divide the Numerator by the Denominator
expand_more Start by dividing the numerator of the improper fraction by the denominator. Note that the quotient must be an integer number.
Here, the result of the division of 21 by 4 is the quotient of 5 with a remainder of 1.
2
Write the Integer Part
expand_more Recall that a mixed number consists of an integer part and a proper fraction. The integer part is equal to the quotient of the improper fraction. In this case, it is 5.
3
Write the Fraction Part
expand_more Now the numerator and denominator of the fraction part will be identified. The numerator is equal to the remainder of the division from the first step. In this case, the remainder is 1 and becomes the numerator of the fraction part.
Note that the numerator must be less than the denominator since the fraction part of a mixed number is a proper fraction. The denominator is the same as the denominator of the improper fraction. Therefore, its value is 4.
The numerator is less than the denominator, so the fraction is indeed a proper fraction. Finally, finding the mixed number corresponding to 214 is complete.
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Example
A Note Hidden in the Bookshelf
Izabella found a second note in her bookshelf.
External credits: @gstudioimagen
a
87/5
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b
115/9
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c
What is the code?
{"type":"text","form":{"type":"list","options":{"comparison":"1","nofractofloat":false,"keypad":{"simple":true,"useShortLog":false,"variables":["x"],"constants":["PI"]},"rendered":false,"ordermatters":true,"numinput":2,"listEditable":false,"hideNoSolution":true},"text":""},"formTextBefore":null,"formTextAfter":null,"answer":{"text":["17","12"]}}
Hint
a
Divide the numerator by the denominator using the long division.
c
Identify the integer parts of the mixed numbers to find the code.
Solution
a
Izabella needs to rewrite 875 as a mixed number. Let's use long division to divide the numerator by the denominator.
The quotient is 17 with a remainder of 2. Let's use this fact to rewrite 87 5 as a mixed number, remembering that the denominator is the same as the denominator of the improper fraction. 87/5= 17 2 5
b
This time, Izabella needs to rewrite 1159 as an improper fraction. Let's divide 115 by 9 using long division.
The quotient is 12 with a remainder of 7. Let's use this fact to rewrite 115 9 as a mixed number, remembering that the denominator is the same as the denominator of the improper fraction. 115/9= 12 7 9
c
We can find the code using our answers from Parts A and B. Let's identify the integer parts of both mixed numbers we found.
17 25 12 79 ⇓ 17, 12 The code is 17, 12.
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Pop Quiz
Converting Between Mixed Numbers and Improper Fractions
Convert each mixed number to an improper fraction, or each improper fraction to a mixed number. If the improper fraction equals an integer, leave the fraction fields empty. Do not simplify the fraction in a mixed number.
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Discussion
Introducing Decimal Numbers
While mixed numbers help us estimate the value of an improper fraction, they are not very convenient in calculations. In times like this, decimal numbers may be more convenient.
Concept
Decimal Numbers
Numbers that lie between integers on the number line can be written as decimal numbers. Decimal numbers consist of an integer part, a decimal point as a separator, and a non-zero decimal part written to the right of the decimal point. Consider the decimal number 12.346.
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Discussion
Converting a Decimal Number Into a Fraction
It is possible to convert a decimal number into a fraction and the other way around. Consider the following decimal number. 0.56 A decimal number can be rewritten as a fraction in three steps.
1
Count the Number of Decimal Places n
expand_more The number 0.56 can be read as 
56 hundredths.There are two decimal places.
2
Write as a Fraction With the Denominator of 10^n
expand_more The number has 2 decimal places. This means that 0.56 can be written it as a fraction with a numerator of 56 and with a denominator of 10^2.
0.56=56/10^2 ⇓ 0.56=56/100
3
Simplify the Fraction
expand_more Next, check whether 56100 can be simplified. Start by splitting the numerator and denominator into prime factors.
56 & = 2* 2* 2* 7 100 & = 2* 2* 5* 5
The numbers share two common factors. Their product is the greatest common factor (GCF) of 56 and 100.
GCF(56,100)=2* 2=4
Finally, divide both the numerator and denominator by 4.
The fractions 1425 and 56100 are equivalent and they both correspond to the decimal 0.56.
Extra
Interact With an Applet That Converts Decimals to FractionsSubmit a decimal number between 0.001 and 1 with no more than 3 digits after the decimal point. Then, the process of converting that decimal into a fraction will be shown.
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Example
A Clue Among the Kitchen Supplies
Izabella's sister wants her to pack two different types of cookies for a party. She leaves Izabella a clue as to how many of each type she wants.
External credits: @upklyak
a
1.98
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b
0.564
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c
How many cookies of each type does Izabella need?
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Hint
a
The number 1.98 has two decimal places. That means it can be rewritten as a fraction with the numerator of 198 and the denominator of 100.
b
Simplify the fraction by dividing the numerator and denominator by their greatest common factor (GCF).
c
Evaluate the expressions a-b and 2c-d.
Solution
a
The number 1.98 has two decimal places, so we can rewrite it as a fraction with a numerator of 198 and a denominator of 100.
1.98=198/100 Now we need to simplify the fraction. Start by splitting the numerator and denominator into prime factors. 198&= 2* 3* 3* 11 100&= 2* 2* 5* 5 The numbers share only one common factor, 2, so this is their GCF. Let's divide both the numerator and denominator by 2 to simplify the fraction.
The calculations show that the decimal number 1.98 corresponds to the improper fraction 9950.
b
We can write the decimal 0.564 as a fraction using the same method we used in Part A. Since 0.564 is read as 564 thousandths,
we can write it as 564 over 1000.
0.564=564/1000 Next, we split the numerator and the denominator into prime factors to simplify the fraction. 564&= 2* 2* 3* 47 1000&= 2* 2* 2 * 5* 5* 5 The numbers share two common factors. Their product is the GCF of 564 and 1000. GCF(564,1000)=2* 2=4 Finally, divide the numerator and denominator by 4 and simplify the fraction.
This means that 0.564 is equal to 141250.
c
To find the number of chocolate chip cookies Izabella needs, let's first find the values of a and b using our answer from Part A.
a/b=99/50 Now let's substitute 99 for a and 50 for b into the expression a- b.
Izabella needs 49 chocolate chip cookies. Now let's find out how many sugar cookies she needs. First, we will use our answer from Part B to set the fractions corresponding to 0.564 equal to each other. c/d=141/250 Now, let's substitute the found values of c and d and evaluate the second expression.
Izabella needs to pack 32 sugar cookies. Now her sister is ready for her party!
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Discussion
Converting a Fraction Into a Decimal Number
It is possible to convert a fraction into a decimal number and the other way around. Consider the following fraction. 16/25 Divide the numerator of 16 by the denominator of 25 by using the long division to rewrite the fraction as a decimal.
Extra
Rewriting Fractions With the Denominators That Are Powers of 10A fraction can have a denominator that is a power of 10. Consider a few examples.
| Fraction | 7/10 | 26/100 | 782/1000 |
|---|
In that case, the procedure of the long division of the numerator by the denominator is not the best way to go. Instead, the fraction can be rewritten directly as a decimal. First, count how many zeros each denominator has.
| Fraction | 7/1 0 | 26/1 00 | 782/1 000 |
|---|---|---|---|
| Number of Zeros | 1 | 2 | 3 |
Then, move the decimal point of the numerator to the left the number of times equal to the number of zeros in the denominator. For example, in the case of 710, there is one zero. This indicates that the decimal point of 7 will be moved one place to the left.
The rest of the fractions can be rewritten into decimal numbers in a similar manner.
| Fraction | 7/10 | 26/100 | 782/1000 |
|---|---|---|---|
| Number of Zeros | 1 | 2 | 3 |
| Decimal | 0.7 | 0.26 | 0.782 |
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Example
Living Room Locked Box
Izabella finds a locked box in the living room.
External credits: @upklyak
a
Write 425 as a decimal to two decimal places.
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b
Write 71168 as a decimal to two decimal places.
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c
What pair of numbers opens the box? Give the numbers in order.
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Hint
a
Multiply the numerator and denominator by 4 for the fraction to have the denominator of 100.
b
Divide the numerator by the denominator using the long division.
c
Multiply each decimal number by 100.
Solution
a
We want to write the fraction 425 as a decimal. Let's start by multiplying the numerator and the denominator by 4 to get a fraction with a denominator of 100.
The denominator is a power of 10 and has two zeros, so we can move the decimal point of the numerator two places to the left to write the fraction as a decimal.
Therefore, 425 or 16100 written as a decimal is 0.16. 16/100=0.16
b
Now we need to rewrite the fraction 71168 as a decimal. We will divide 71 by 168 using long division. Let's calculate the decimal to two decimal places.
The decimal is 0.42. This means that the fraction 71168 is equal to about 0.42.
c
We can find the code for the lock box by evaluating the given expressions.
4/25=x The first number of the combination is100x. In Part A, we found that 425=0.16, so x= 0.16. Let's use this value to evaluate the expression.
The first number in the combination is 16. Let's check the second clue. 71/168=y The second number of the combination is100y. In Part B, we found that 71168≈ 0.42, so y ≈ 0.42. This value equals y. Let's find the second number of the combination.
The combination to the locked box is 16, 42.
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Pop Quiz
Converting Between Decimal Numbers and Fractions
Convert the given decimal number into the corresponding fraction, or the given fraction into a decimal number. Round the decimal number to two decimal places if needed.
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Closure
Advantages of Each Type of Numbers
In this lesson, three forms of real numbers were discussed: fractions, mixed numbers, and decimal numbers.
Each number form has their own advantages and disadvantages. Consider what those may be.
| Fractions | Mixed Numbers | Decimals | |
|---|---|---|---|
| Pros | Precise and accurate | Show the actual value of a number | Easy to use in calculations |
| Cons | More difficult to use in calculations | Very inconvenient in calculations | Sometimes, decimals are approximations of the exact value. |
Depending on the situation, some forms of numbers might be more useful than other. Here are some real-world examples.
- Two farmers want to sell a portion of their harvest to the other. One farmer says,
Let's each sell 0.166666... of our harvests to each other!
The other farmer says,Hold up! That is such an inconvenient number. How about 16 of our harvests?
Now they agree. - Imagine being told that a tree grew 134 feet last year. Now imagine being told that same tree grew 3 14 feet last year. The second number form is more commonly used because it gives a clearer image of height.
- A local market writes the price of one kilogram of apples on one box as $4 1925 and on another box as $ 11925. Imagine trying to figure out how much cash to give at the register! It would be much easier to understand how to pay $4.76.
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Mixed and Decimal Numbers
Exercise 2.1
Dominika told him that she also read an article about this. However, in that article, 45 % or 0.45 of people read at the speed of more than 170 words per minute.
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{"type":"choice","form":{"alts":["Yes","No"],"noSort":false},"formTextBefore":"","formTextAfter":"","answer":1}
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Diego read that 5 out of 12 people in the state read at the speed of more than 170 words per minute. This data corresponds to the fraction of 512. Let's write it as a decimal number by dividing the numerator 5 by the denominator 12.
We used the long division and divided up to three decimal places. The decimal is 0.416, which can be rounded to 0.42.
We can read the decimal number 0.45 as 45 hundredths.
This means that we can write it as a fraction with the numerator of 45 and the denominator of 100.
0. 45=45/100
Next, let's see if we can simplify the fraction. We split the numerator and denominator into prime factors.
45&=3* 3* 5
100&=2* 2* 5* 5
The numbers share just one common factor. This is their GCF.
GCF(45,100)=5
Now we divide the numerator and the denominator of the fraction by 5.
Therefore, the decimal corresponds to 920.
Let's compare what we found in the previous parts. c|c Part A & Part B [0.4em] [-0.8em] 5/12≈ 0.42 & 0.45=9/20 When we compare the decimals 0.42 and 0.45, we can say that they are not equal. In other words, the data that Diego and Dominika read in different articles is different. However, the numbers are pretty close to each other.
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Solution
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{"type":"choice","form":{"alts":["Emily's","Tadeo's","The heights are the same."],"noSort":true},"formTextBefore":"","formTextAfter":"","answer":1}
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We want to rewrite 2912 as a mixed number. We can do this by using long division. Let's calculate the quotient of the numerator of 29 and the denominator of 12.
The quotient is 2 with the remainder of 5. The quotient will be the integer part of our mixed number. The remainder will be the numerator of our mixed number. We use the denominator of the improper fraction for our mixed number. 29/12= 2 5 12
We will use the following formula to rewrite 3 17 as an improper fraction. a b c=a * c+ b/c We see that a= 3, b= 1, and c= 7 for the given mixed number. Let's substitute these values into the formula and simplify the expression.
The mixed number corresponds to 227.
Let's compare the mixed numbers to determine whose tree is higher. Emily's Tree:& 2 512 feet [0.1cm] Tadeo's Tree:& 3 17 feet We can see that since the integer part 3 is greater than 2, Tadeo's tree is higher than Emily's. Tadeo's Tree & & Emily's Tree [0.1cm] 3 17 & > & 2 512
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Solution
Pair the fractions with the corresponding mixed numbers and decimals.
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We want to pair the fractions with the corresponding mixed numbers and decimal numbers. Let's consider each fraction one at a time.
First Fraction
The first fraction is 3729. Its numerator is greater than the denominator. 37/29 and 37 > 29 This indicates that a mixed number could correspond to this fraction. Let's use long division to convert the fraction into a mixed number.
The quotient is 1 with the remainder of 8. This means that the given fraction is equal to the mixed number with the integer part of 1, the numerator of 8, and the denominator of 29. 37/29=1 829
Second Fraction
The second fraction is 75100. In this case, the numerator is less than the denominator, so the fraction cannot correspond to a mixed number. 75/100 and 75 < 100 This means that the fraction corresponds to a decimal. Note that the denominator is 100, which is a power of 10. It has two zeros, so we need to move the decimal point of the numerator two places to the left.
Therefore, 75100 corresponds to 0.75.
Third Fraction
The third fraction is 6418. The numerator 64 is greater than the denominator 18, so the fraction can correspond to a mixed number. We can find it by dividing 64 by 18.
The quotient is 3 and the remainder is 10. Therefore, the corresponding mixed number is 3 1018. Note that the fraction part can be simplified as both the numerator and the denominator are even numbers. Let's divide them by 2. 3 1018 → 3 59 The final mixed number is 3 59.
Fourth Fraction
We have one option left, which is 0.485. Let's follow the steps we followed before and check if 52107 corresponds to 0.485. We will rewrite it as a decimal by dividing 52 by 107.
The fraction 52107 corresponds to the decimal 0.485. We have successfully matched the fractions.
| Fraction | Mixed Number/Decimal |
|---|---|
| 37/29 | 1 829 |
| 75/100 | 0.75 |
| 64/18 | 3 59 |
| 52/107 | 0.485 |
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Mixed and Decimal Numbers
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