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Pearson Algebra 1 Common Core, 2011
PA
Pearson Algebra 1 Common Core, 2011 View details
8. An Introduction to Equations
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Exercise 36 Page 56

20 times what number equals 100?

5

Practice makes perfect

Consider the given equation. 20a=100In order to solve this equation using mental math, we want to think about what it means in words. 20 a = 100 20times a number equals 100 We know that 20 times 5 equals 100. Therefore, a=5. Let's now check our solution.

20a? =100
Substitute

a= 5

20( 5)? =100
Multiply

Multiply

100=100 ✓
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arrow_right Lesson Check p.56
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arrow_right Practice and Problem-Solving Exercises p.56-58
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Practice and Problem-Solving Exercises 8 (Page 56)
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Practice and Problem-Solving Exercises 39 (Page 57)
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arrow_right Standardized Test Prep p.58
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