1. EXAMPLE 1
Multiply Decimals Using Mental Math a.

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

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

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

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

6. 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.

7. = .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.

8. = .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. =

9. 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?

10. 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?

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

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

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

14. 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

15. 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.

16. EXAMPLE 3
Divide Decimals Using Mental Math a.

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

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

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

20. 508.3 10 508.3 0.01 EXAMPLE 3 Divide Decimals Using Mental Math a. =
Move 1 place to the left.
= 50.83 b.

21. 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.

22. 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.

23. 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

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.

27. 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.

28. 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.

29. 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.

30. 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.

31. 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.

32. 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.

33. 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.

34. 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.

35. 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.

36. 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.

37. 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.

38. 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.

39. 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.

40. 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.

41. 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.

42. 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.

43. 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.

44. 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.

45. 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

46. 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.

47. 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.

48. 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.