Lesson 1: Relationships between Operations

Which expression is equivalent to:

10 + 10 + 10

• 10 x 3

• 10 + 3

• 3 + 10

• 10 $\div$ 3

Which expression is equivalent to:
4 + 4 + 4 + 4 + 4 + 4 + 4

• 4 x 5

• 4 + 7

• 4 x 7

• 7 $\div$ 4

Which expression is equivalent to:
8 x 2

• 8 x 8

• 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2

• 2 + 2

• 8 + 8

Which expression is equivalent to:
3 x 9

• 9 x 9 x 9

• 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3 x 3

• 3 + 3 + 3

• 9 + 9 + 9

Which expression is equivalent to:
6m

• m x m  x m x m x m x m

• 6 x 6

• m + m  + m + m + m + m

• 6 + 6 + 6 + 6 + 6 + 6

Which expression is equivalent to:
d + d + d + d + d

• 5d

• d x d x d x d x d

• 5 + d

• d + 5

Because multiplication "undoes" division and subtraction "undoes" addition and are opposites, they are called __________________ operations.

• correct

• equivalent

• inverse

• transverse

Fill in the blank:

450 - 230 + 230 = _________

• 200

• 230

• 450

• 220

Fill in the blank:
56 x ______  $\div$  8 = 56

• 56

• 8

• 448

• 7

If 12 $\div$ x = 3, how many times would 3 have to be subtracted from 12 in order for the answer to be zero?

• 12

• 3

• x

• 4