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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 13 Page 51

Pay close attention to the order of operations.

30

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 exponent expression before multiplying and finally subtracting the numbers. 12-3^2(- 2) Let's do it!

Operation Before Simplification After Simplification
Calculate power 12-3^2(- 2) 12- 9(- 2)
Multiply 12- 9(- 2) 12-(- 18)
Subtract terms 12-( - 18) 30
The expression is equal to 30.

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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