Unit 3 Review

• $6\ \frac{2}{3}\ hours$

• $7\ \frac{2}{3}\ hours$

• $6\ \frac{1}{6}\ hours$

• $7\ \frac{1}{6}\ hours$

• 21

• 23

• 7

• 9

• 9 hours

• 7 hours

• 5 hours

• 8 hours

• $3\ \frac{1}{4}$

• $3$

• $2\ \frac{2}{3}$

• $2\ \frac{1}{4}$

• $5100

• $5000

• $4000

• $4900

Which number sentence illustrates the associative property of addition?

• (7 + 5) + 3 = 7 + (5 + 3)

• 7(5 + 3) = 35 + 21

• 7 + (-7) = 0

• 7 + 5 = 5 + 7

Which property of real numbers justifies the statement

bc = cb ?

• Commutative property of multiplication

• Associative property of addition

• Commutative property of addition

• Associative property of multiplication

Which property is used in the following number sentence?

6(2 + n) = (6 • 2) + (6 • n)

• Associative property of addition

• Additive inverse property

• Commutative property of addition

• Distributive property

The teacher shows her work when simplifying an expression.

5(4 - 2 + x) + 2 + 1

Step 1: 5(2 + x) + 2 + 1

Step 2: 10 + 5x + 2 + 1

Step 3: 5x + 10 + 2 + 1

Step 4: 5x + 12 + 1

Step 5: 5x + 13

Which step was a result of applying the distributive property?

• Step 1

• Step 4

• Step 3

• Step 2

The multiplicative identity property is used to complete the statement below.

4 - (5 • 1) + 2 = _?_

Which expression completes the statement?

• -1 • 1 + 2

• 4 - 5 • 3

• 4 - 1 + 2

• 4 - 5 + 2