Find Unknown Number

4 + ____ = 7

5 + _____ = 12

20 + ______ = 25

_____ + 10 = 20

A missing piece of information

• unknown

• equation

• multiplication

• factor

5 = 40 ÷ ?

• 20

• 35

• 8

• 2

6 = 30 ÷ ?

• 24

• 10

• 5

• 2

5 = ? ÷ 5

• 25

• 10

• 9

• 1

Find the value of a

5 x a =25

• a = 4

• a = 6

• a = 5

• a = 20

7 = ? ÷ 3

• 21

• 10

• 4

• 20