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Big Ideas Math: Modeling Real Life, Grade 7

BI

Big Ideas Math: Modeling Real Life, Grade 7 View details

5. Subtracting Rational Numbers

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Exercise 1 Page 30

Subtracting a number is the same as adding its opposite.

2/3

Practice makes perfect

We want to find the difference. Let's look at the given expression! 1/3-( - 1/3)We can recall that subtracting a number is the same as adding its opposite. 1/3-( - 1/3)= 1/3+1/3 Now, we can find the sum of two numbers with the same sign. We can do so by finding the sum of their absolute values.

|1/3|+|1/3|

|1/3|=1/3

1/3+1/3

Add fractions

1+1/3

Add terms

2/3

Notice that both numbers in our expression have a positive sign. This means that that the difference is also a positive number.

Subchapter links

Try It p.30-32

Self-Assessment for Concept & Skills p.32

Self-Assessment for Problem Solving p.33

Review & Refresh p.34

Concept, Skills, & Problem Solving p.34-36