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Big Ideas Math: Modeling Real Life, Grade 7

BI

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

3. Adding Rational Numbers

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Exercise 16 Page 21

When calculating the sum of two numbers with the same sign, we add their absolute values.

1.844

Practice makes perfect

We want to find the sum and simplify the result of the addition. Let's look at the given expression! 12.48+( - 10.636)Now, we can find the sum of two numbers with different signs. We can do so by subtracting the lesser absolute value from the greater absolute value. Then, we can use the sign of the number with the greater absolute value. Let's calculate the absolute value of the numbers! | 12.48|=12.48and| - 10.636|=10.636 Notice that | 12.48| is greater than | - 10.636|. This means that we should subtract | - 10.636| from | 12.48|. Let's do it!

|12.48|-|- 10.636|

|12.48|=12.48

12.48-|- 10.636|

|-10.636|=10.636

12.48-10.636

Subtract term

1.844

Subchapter links

Try It p.18-19

Self-Assessment for Concept & Skills p.19

Self-Assessment for Problem Solving p.20

Review & Refresh p.21

Concept, Skills, & Problem Solving p.21-22