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

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Presentation on theme: "EXAMPLE 1 Multiply Decimals Using Mental Math a. 0.05 1000."— Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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

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

13 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.

14 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

15 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 In 2000, 42,500,000 vehicles crossed the Golden Gate Bridge. ANSWER

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

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

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

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

20 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

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

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

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

24 GUIDED PRACTICE for Example 1,2 and 3

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

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

27 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.

28 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.

29 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

30 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. Move 2 places to the left. 2. 153.6 0.01

31 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. = 1.536 Move 2 places to the left. 2. 153.6 0.01

32 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. = 1.536 Move 2 places to the left. 3. 42.6 100 2. 153.6 0.01

33 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. = 1.536 Move 2 places to the left. 3. 42.6 100 Move 2 places to the left. 2. 153.6 0.01

34 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. = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 2. 153.6 0.01

35 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. = 1.536 Move 2 places to the left. 3. 42.6 100 = 0.426 Move 2 places to the left. 4. 509 1000 2. 153.6 0.01

36 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. = 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. 2. 153.6 0.01

37 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. = 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. 2. 153.6 0.01

38 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. = 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 2. 153.6 0.01

39 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. = 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. 2. 153.6 0.01

40 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. = 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. 2. 153.6 0.01

41 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. = 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 2. 153.6 0.01

42 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. = 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. 2. 153.6 0.01

43 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. = 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. 2. 153.6 0.01

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

45 GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 5.34 10,000,000 Use the graph in Example 2 to estimate the number of vehicles that crossed the George Washington Bridge in 2000. Bridges 7.

46 GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 5.34 10,000,000 Move 7 places to the right. Use the graph in Example 2 to estimate the number of vehicles that crossed the George Washington Bridge in 2000. Bridges 7.

47 GUIDED PRACTICE for Example 1,2 and 3 Find the product or quotient using mental math. 5.34 10,000,000 = 53,400,000 Move 7 places to the right. Use the graph in Example 2 to estimate the number of vehicles that crossed the George Washington Bridge in 2000. Bridges 7.

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


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