Equations Finding Unknown Number

6 + ? = 15

• 8

• 21

• 9

• 10

8 + ? = 16

• 7

• 10

• 9

• 8

3 + ? = 12

• 15

• 9

• 10

• 6

4 + ? = 12

• 8

• 16

• 4

• 10

What is the value of the unknown in the equation below?

54 = ? x 9

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What is the value of the unknown number in the equation 36 = ☐ x 4 ?

• 10

• 9

• 8

• 7

Find the value of a

5 x a =25

• a = 4

• a = 6

• a = 5

• a = 20

Solve for the unknown

5+6 = 4+N

• 9

• 10

• 6

• 7

Select all the equations for which the missing number is 3.

• 6 x ? = 18

• ? ÷ 1 = 3

• 3 x ? = 6

• 23 ÷ ? = 7

• 7 x 3 = ?

Lucy had some money saved. She spent $8 of that money on lunch. She added $50 to her savings from money earned for washing dishes all week. After these transactions, her savings was $67. Which number sentence could be used to find s, the amount of money Lucy had before these transaction?

• s - 8 + 50 = 67

• 67 + s = 50 + 8

• (50-8) - s = 67

• 67 - 8 + 50 = a