Finding the Unknown Number in an Equation

15 - ? = 8

• 7

• 5

• 6

• 8

The camping club wants to rent rafts. Each raft can hold 5 people. Which equation could be used to find how many rafts are needed for 25 people?

• 5 x n = 25

• 25 x n = 5

• 5 x 25 = n

___ X 6=36

• 6

• 3

• 9

What number makes this equation true?

4=____x2

• 2

• 5

• 1

• 3

Find the missing factor

24=8x_____

• 7

• 3

• 5

• 16

3 x k = 21 k=?

• k=6

• k=4

• k=18

• k=7

p x 10 = 90 p=?

• p=2

• p=5

• p=8

• p=9

A variable represents what is ______________. 

• the answer

• the operation

• the difference

• unknown 

t x 2 = 12

• 6

• 5

• 4

• 2

4 x 5 = X

• 25

• 20

• 13

• 10