Assessment

Evaluate Yourself!

x - 3 = 7

x = 3 + 7

x = 10

Checking:

10 - 3 = 10

10 = 10

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9x = 81

x = 9 ÷ 81

x = 9

Checking:

9(9) = 81

81 = 81

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x ÷ 5 = 9

x = 5 x 9

x = 45

Checking:

45 ÷ 5 = 9

9=9

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x + 12 = 20

x = 20 - 12

x = 8

Checking:

8 + 12 = 20

20 = 20

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x ÷ 8 = 3

x = 8 x 3

x = 24

Checking:

24 ÷ 8 = 3

3= 3

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x + 15 = 25

x = 15 - 25

x = 10

Checking:

10 + 15 = 25

25= 25

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4x = 28

x = 28 ÷ 4

x = 7

Checking

4 x 7 = 28

28=28

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x - 6 = 11

x = 6 + 11

x = 17

Checking:

17 - 6 = 11

11 = 11

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Real Life Equations

You have $50 and spend $18 on snacks. How much money do you have left?

x + 18 = 50

Subtract 18 from both sides:

x = 50 - 18

x = 32

You have $32 left.

Checking:

32 + 18 = 50

50 = 50

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A car travels 60 miles per hour. How far does it travel in 3 hours?

60x = 180

Divide both sides by 60:

x= 180 ÷ 60

x=3

The car travels 180 miles.

Checking:

60 x 3 = 180

180 = 180

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You have $30 in your savings account and deposit $20. How much money do you have now?

x + 20 = 30

Subtract 20 from both sides:

x = 30 - 20

x= 10

You had $10 before the deposit.

Checking:

10 + 20 = 30

30 = 30

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