Big Ideas Math: Modeling Real Life, Grade 6
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Chapter Review
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Exercise 14 Page 98

Rewrite the expression so that all of the numbers are fractions. Remember that dividing fractions is the same as multiplying the first fraction by the reciprocal of the second fraction. Rewrite your answer as a mixed number.

2 920

Practice makes perfect
Before we evaluate the expression, let's first rewrite the mixed number as a fraction.
1 25Ă· 4/7
1* 5+2/5Ă·4/7
5+2/5Ă· 4/7
7/5Ă·4/7
Recall that dividing fractions is the same as multiplying the first fraction by the reciprocal of the second fraction. 7/5Ă·4/7=7/5*7/4 When we multiply fractions, we need to remember that the product of two fractions is equal to the product of the numerators divided by the product of the denominators. Let's find the given product!
7/5*7/4
7* 7/5* 4
49/20
Note that 49 and 20 do not have common factors so the quotient is 4920. We can also write this fraction as a mixed number.
49/20
40+9/20
40/20+9/20
2+9/20
2 920

Checking Our Answer

Let's check our answer using a calculator. Because our answer is a mixed number, we need to compare the quotient of the original numbers to the decimal that is equivalent to the final quotient that we found. First, let's find the decimal form of our quotient. Note that each mixed number can be written as the sum of an integer and a fraction.

Now we will find the quotient of the fractions using the calculator. Remember to use parentheses around each of the fractions so that the order of operations is performed correctly! Calculators cannot read our minds, unfortunately.

Because the calculator found the same decimal for both calculations, we know that our answer was correct!