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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
1. Multiplying Integers
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Exercise 38 Page 53

Pay close attention to the order of operations.

0
Practice makes perfect
According to the order of operations, expressions inside parentheses are evaluated first, followed by exponents, then multiplication and division, and finally addition and subtraction are evaluated last. We can use the acronym PEMDAS to help us remember the correct order!
pemdas

For the given expression, this means evaluating the expression inside the parentheses completely before adding the product. 2+1* (- 7+5) Let's do it!

Operation Before Simplification After Simplification
Add Terms 2+1* ( - 7+ 5) 2+1* ( - 2)
Multiply 2+ 1* ( - 2) 2+( - 2)
Add terms 2+( - 2) 0
The expression is equal to 0.

Alternative Solution

 Using a Calculator

We can also evaluate this expression using a calculator. To do so, we type it as shown below.

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arrow_right Self-Assessment for Problem Solving p.52
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