EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000.

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Presentation transcript:

EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000

Multiply Decimals Using Mental Math EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000 Move 3 places to the right.

Multiply Decimals Using Mental Math EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000 = 0 0 5 0. Move 3 places to the right.

Multiply Decimals Using Mental Math EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000 = 0 0 5 0. Move 3 places to the right. = 50

Multiply Decimals Using Mental Math EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000 = 0 0 5 0. Move 3 places to the right. = 50 b. 95.38 0.0001

Multiply Decimals Using Mental Math EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000 = 0 0 5 0. Move 3 places to the right. = 50 b. 95.38 0.0001 Move 4 places to the left.

= .0 0 9 5 3 8 EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000 = 0 0 5 0. Move 3 places to the right. = 50 b. 95.38 0.0001 = .0 0 9 5 3 8 Move 4 places to the left.

= .0 0 9 5 3 8 EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000 = 0 0 5 0. Move 3 places to the right. = 50 b. 95.38 0.0001 = .0 0 9 5 3 8 Move 4 places to the left. = 0.009538

EXAMPLE 2 Multiply Decimals by Powers of Ten Bridges The graph shows the number of vehicles that crossed bridges during 2000. How many vehicles crossed the Golden Gate Bridge?

EXAMPLE 2 Multiply Decimals by Powers of Ten Bridges The graph shows the number of vehicles that crossed bridges during 2000. How many vehicles crossed the Golden Gate Bridge?

EXAMPLE 2 Multiply Decimals by Powers of Ten 4.25 10,000,000

Multiply Decimals by Powers of Ten EXAMPLE 2 Multiply Decimals by Powers of Ten 4.25 10,000,000 Move 7 places to the right.

Multiply Decimals by Powers of Ten EXAMPLE 2 Multiply Decimals by Powers of Ten 4.25 10,000,000 = 4 2 5 0 0 0 0 0 . Move 7 places to the right.

Multiply Decimals by Powers of Ten EXAMPLE 2 Multiply Decimals by Powers of Ten 4.25 10,000,000 = 4 2 5 0 0 0 0 0 . Move 7 places to the right. = 42,500,000

Multiply Decimals by Powers of Ten EXAMPLE 2 Multiply Decimals by Powers of Ten 4.25 10,000,000 = 4 2 5 0 0 0 0 0 . Move 7 places to the right. = 42,500,000 ANSWER In 2000, 42,500,000 vehicles crossed the Golden Gate Bridge.

EXAMPLE 3 Divide Decimals Using Mental Math a. 508.3 10

508.3 10 EXAMPLE 3 Divide Decimals Using Mental Math a. 508.3 10 Move 1 place to the left.

508.3 10 EXAMPLE 3 Divide Decimals Using Mental Math a. = 5 0 . 8 3 508.3 10 = 5 0 . 8 3 Move 1 place to the left.

508.3 10 EXAMPLE 3 Divide Decimals Using Mental Math a. = 5 0 . 8 3 508.3 10 = 5 0 . 8 3 Move 1 place to the left. = 50.83

508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a. 508.3 10 = 5 0 . 8 3 Move 1 place to the left. = 50.83 b. 508.3 0.01

508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a. 508.3 10 = 5 0 . 8 3 Move 1 place to the left. = 50.83 b. 508.3 0.01 Move 2 places to the right.

508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a. 508.3 10 = 5 0 . 8 3 Move 1 place to the left. = 50.83 b. 508.3 0.01 = 5 0 8 3 0 . Move 2 places to the right.

508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a. 508.3 10 = 5 0 . 8 3 Move 1 place to the left. = 50.83 b. 508.3 0.01 = 5 0 8 3 0 . Move 2 places to the right. = 50,830

GUIDED PRACTICE for Example 1,2 and 3

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

GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 Move 3 places to the right.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 Move 2 places to the left.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 Move 2 places to the left.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 Move 3 places to the left.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 = 0.509 Move 3 places to the left.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 = 0.509 Move 3 places to the left. 5. 5 0.1

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 = 0.509 Move 3 places to the left. 5. 5 0.1 Move 1 places to the right.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 = 0.509 Move 3 places to the left. 5. 5 0.1 = 50 Move 1 places to the right.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 = 0.509 Move 3 places to the left. 5. 5 0.1 = 50 Move 1 places to the right. 6. 3.2 0.001

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 = 0.509 Move 3 places to the left. 5. 5 0.1 = 50 Move 1 places to the right. 6. 3.2 0.001 Move 3 places to the right.

Find the product or quotient using mental math. GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 1. 6.07 1000 = 6070 Move 3 places to the right. 2. 153.6 0.01 = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 = 0.509 Move 3 places to the left. 5. 5 0.1 = 50 Move 1 places to the right. 6. 3.2 0.001 = 3200 Move 3 places to the right.

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.

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. 5.34 10,000,000

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. 5.34 10,000,000 Move 7 places to the right.

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. 5.34 10,000,000 = 53,400,000 Move 7 places to the right.

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. 5.34 10,000,000 = 53,400,000 Move 7 places to the right. ANSWER In 2000, 53,400,000 vehicles crossed the George Washington Bridge.