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Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
3. Adding Rational Numbers
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Exercise 1 Page 18

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

- 2

Practice makes perfect
We want to find the sum and simplify the result of the addition. Let's look at the given expression! - 1/2+( - 3/2) When adding or subtracting fractions they should have the same denominator. In this case, we have two fractions with the same denominator. Now, we can find the sum of two fractions with the same signs. Recall that we can do so by adding their absolute values. Let's do it!
|- 1/2|+|- 3/2|
AbsNeg

|-1/2|=1/2

1/2+|- 3/2|
AbsNeg

|-3/2|=3/2

1/2+3/2
AddFrac

Add fractions

1+3/2
AddTerms

Add terms

4/2
CalcQuot

Calculate quotient

2
Recall that both numbers are negative. This means that the sum is also a negative number, - 2.
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arrow_right Try It p.18-19
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Try It 2 (Page 18)
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Try It 4 (Page 19)
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Try It 6 (Page 19)
arrow_right Self-Assessment for Concept & Skills p.19
Self-Assessment for Concept & Skills 7 (Page 19)
Self-Assessment for Concept & Skills 8 (Page 19)
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Self-Assessment for Concept & Skills 10 (Page 19)
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arrow_right Self-Assessment for Problem Solving p.20
Self-Assessment for Problem Solving 12 (Page 20)
Self-Assessment for Problem Solving 13 (Page 20)
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