Repeated Addition

The product of these two multiplication problems is the same.

3 x 8

8 x 3

True or false?

• True

• False

The product of these two multiplication problems is the same.

20 x 95

95 x 20

True or false?

• True

• False

The product of these two multiplication problems is the same.

210 x 11

11 x 200

True or false?

• True

• False

Answer explanation

False! One is multiplied by 200, and the other is multiplied by 210, so the products cannot be equal!

How could you write this multiplication problem as an addition problem?

7 x 4

• 7 + 7 + 7 + 7 + 7

• 4 + 4 + 4 + 4 + 4 + 4 + 4

How could you write this addition problem as a multiplication problem?

2 + 2 + 2 + 2 + 2 + 2

• 2 x 6

• 7 x 2

These two addition problems have the same sum.

5 + 5 + 5

3 + 3 + 3 + 3 + 3

True or false?

• True

• False

Answer explanation

True! Both equal 15.

How could you simplify the following addition problem using multiplication?

1 + 1 + 1 + 8 + 8

• (8 x 1) + (8 x 1) + (8 x 1)

• (3 x 1) + (2 x 8)

How could you simplify the following addition problem using multiplication?

9 + 9 + 9 + 9 + 9 + 4 + 4 + 4

• (9 x 4) + (4 x 4)

• (9 x 4) + (3 x 4)

• (9 x 5) + (3 x 5)

• (9 x 5) + (3 x 4)

How could you simply this addition problem using multiplication?

502 + 502 + 502 + 502 + 502 + 47 + 47

• (502 x 4) + (47 x 502)

• (502 x 5) + (47 x 2)

• (502 x 4) + (47 x 2)

Solve the following:

2 + 2 + 2 + 10 + 10 = _______