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Big Ideas Math: Modeling Real Life, Grade 7

BI

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

Cumulative Practice

Exercise 7 Page 44

Start by considering the signs of the addends in our expression.

- 11.97

We want to determine the value of the given expression. Let's look at our expression! - 9.74+( - 2.23) Notice that both addends in our sum have the same sign. In this case, we can find the sum by adding their absolute values.

|- 9.74|+|- 2.23|

|-9.74|=9.74

9.74+|- 2.23|

|-2.23|=2.23

9.74+2.23

Add terms

11.97

Notice that both numbers in our sum expression have a negative sign. This means that the sum of - 9.74 and - 2.23 is also a negative number, - 11.97.

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