Missing Numbers in Equations

4 x ? = 20

• 3

• 6

• 8

• 5

? ÷ 6 = 4

• 12

• 10

• 18

• 24

w + 12 = 20

• w = 32

• w = -32

• w = 8

• w = -8

-5 + x = 17

• 23

• 12

• -85

• 85

x/4 = 16

• 64

• 4

• 12

• 20

3n = 39

• 117

• 36

• 12

• 13

r + 40 = 100

• 140

• 2

• 70

• 60

Solve the equation
23 - c = 21

• 9

• 4

• 2

• 44

Find the missing number.
What does a equal to ?
a - 4 = 2

• a = 5

• a = 6

• a = 12

• a = 0

What missing number will make the equation true?

10 − 4=____+2

• 4

• 3

• 5