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EXAMPLE 1 Multiply Decimals Using Mental Math a.

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**Multiply Decimals Using Mental Math**

EXAMPLE 1 Multiply Decimals Using Mental Math a. Move 3 places to the right.

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**Multiply Decimals Using Mental Math**

EXAMPLE 1 Multiply Decimals Using Mental Math a. = Move 3 places to the right.

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**Multiply Decimals Using Mental Math**

EXAMPLE 1 Multiply Decimals Using Mental Math a. = Move 3 places to the right. = 50

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**Multiply Decimals Using Mental Math**

EXAMPLE 1 Multiply Decimals Using Mental Math a. = Move 3 places to the right. = 50 b.

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**Multiply Decimals Using Mental Math**

EXAMPLE 1 Multiply Decimals Using Mental Math a. = Move 3 places to the right. = 50 b. Move 4 places to the left.

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**= .0 0 9 5 3 8 EXAMPLE 1 Multiply Decimals Using Mental Math a.**

= Move 3 places to the right. = 50 b. = Move 4 places to the left.

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**= .0 0 9 5 3 8 EXAMPLE 1 Multiply Decimals Using Mental Math a.**

= Move 3 places to the right. = 50 b. = Move 4 places to the left. =

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EXAMPLE 2 Multiply Decimals by Powers of Ten Bridges The graph shows the number of vehicles that crossed bridges during How many vehicles crossed the Golden Gate Bridge?

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EXAMPLE 2 Multiply Decimals by Powers of Ten Bridges The graph shows the number of vehicles that crossed bridges during How many vehicles crossed the Golden Gate Bridge?

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EXAMPLE 2 Multiply Decimals by Powers of Ten ,000,000

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**Multiply Decimals by Powers of Ten**

EXAMPLE 2 Multiply Decimals by Powers of Ten ,000,000 Move 7 places to the right.

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**Multiply Decimals by Powers of Ten**

EXAMPLE 2 Multiply Decimals by Powers of Ten ,000,000 = Move 7 places to the right.

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**Multiply Decimals by Powers of Ten**

EXAMPLE 2 Multiply Decimals by Powers of Ten ,000,000 = Move 7 places to the right. = 42,500,000

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**Multiply Decimals by Powers of Ten**

EXAMPLE 2 Multiply Decimals by Powers of Ten ,000,000 = Move 7 places to the right. = 42,500,000 ANSWER In 2000, 42,500,000 vehicles crossed the Golden Gate Bridge.

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EXAMPLE 3 Divide Decimals Using Mental Math a.

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**508.3 10 EXAMPLE 3 Divide Decimals Using Mental Math a.**

Move 1 place to the left.

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**508.3 10 EXAMPLE 3 Divide Decimals Using Mental Math a. = 5 0 . 8 3**

= Move 1 place to the left.

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**508.3 10 EXAMPLE 3 Divide Decimals Using Mental Math a. = 5 0 . 8 3**

= Move 1 place to the left. = 50.83

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**508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a.**

= Move 1 place to the left. = 50.83 b.

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**508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a.**

= Move 1 place to the left. = 50.83 b. Move 2 places to the right.

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**508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a.**

= Move 1 place to the left. = 50.83 b. = Move 2 places to the right.

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**508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a.**

= Move 1 place to the left. = 50.83 b. = Move 2 places to the right. = 50,830

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GUIDED PRACTICE for Example 1,2 and 3

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GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math.

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GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. Move 3 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. Move 2 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. Move 2 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left. Move 3 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left. = 0.509 Move 3 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left. = 0.509 Move 3 places to the left.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left. = 0.509 Move 3 places to the left. Move 1 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left. = 0.509 Move 3 places to the left. = 50 Move 1 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left. = 0.509 Move 3 places to the left. = 50 Move 1 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left. = 0.509 Move 3 places to the left. = 50 Move 1 places to the right. Move 3 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. = 6070 Move 3 places to the right. = 1.536 Move 2 places to the left. = 0.426 Move 2 places to the left. = 0.509 Move 3 places to the left. = 50 Move 1 places to the right. = 3200 Move 3 places to the right.

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GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 7. Bridges Use the graph in Example 2 to estimate the number of vehicles that crossed the George Washington Bridge in 2000.

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GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 7. Bridges Use the graph in Example 2 to estimate the number of vehicles that crossed the George Washington Bridge in 2000. ,000,000

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 7. Bridges Use the graph in Example 2 to estimate the number of vehicles that crossed the George Washington Bridge in 2000. ,000,000 Move 7 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 7. Bridges Use the graph in Example 2 to estimate the number of vehicles that crossed the George Washington Bridge in 2000. ,000,000 = 53,400,000 Move 7 places to the right.

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**Find the product or quotient using mental math.**

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 7. Bridges Use the graph in Example 2 to estimate the number of vehicles that crossed the George Washington Bridge in 2000. ,000,000 = 53,400,000 Move 7 places to the right. ANSWER In 2000, 53,400,000 vehicles crossed the George Washington Bridge.

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