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**Solve using mental math.**

1. x + 2 = 17 3. x – 7 = 3 ANSWER 15 ANSWER 10 2. x 6 = 4 4. 9x = 54 ANSWER 24 ANSWER 6

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Most Missed on Test Solve using mental math. 1. 3. ANSWER ANSWER 31 4. 2. ANSWER ANSWER -49

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**2 operations that undo each other,**

such as addition and subtraction Equations that have the same solution

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equivalent equation b a b a equivalent equation b a b a

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Party or War? -3 -3 y = 7 7 7 7 10

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b = 29 a = 11 x = -5 y = -2

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**How can we “undo” division?**

60 60 60 12

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x = 13 b = 52 x = -6 m = -56

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3 7 7 3

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Which operation do we do first? -7 -7 4 4 4 12 4

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r = 28 k = 8 7a 7a 7 7 7 9 9

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z = 4 b = 3

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