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 29 Page 56

What gives you 10 when you take away 3?

x=13

Practice makes perfect
To solve this equation using mental math, we want to think about what it means in words. Let's rewrite our given equation as a sentence.

x - 3 = 10 Take 3 away froma number to get10. What number gives us 10 when we take away 3? 13 does.