2. What happens when you multiply
by powers of ten?
Fill in the blanks below (in your
notebook).
Whole Number Powers of Ten Decimal Powers of Ten
10 x 8.3 = _____ 0.1 x 8.3 = _____
100 x 8.3 = _____ 0.01 x 8.3 = _____
1000 x 8.3 = _____ 0.001 x 8.3 = _____
10,000 x 8.3 = _____ 0.0001 x 8.3 = _____
3. What happens when you multiply
by powers of ten?
Check your answers (in your
notebook).
Whole Number Powers of Ten Decimal Powers of Ten
10 x 8.3 = 83 0.1 x 8.3 = 0.83
100 x 8.3 = 830 0.01 x 8.3 = 0.083
1000 x 8.3 = 8,300 0.001 x 8.3 = 0.0083
10000 x 8.3 = 83,000 .0001 x 8.3 = .00083
5. Multiplying by
Powers of Ten
***Copy this in your notebook:
6. Multiplying by
Powers of Ten
***Copy this in your notebook:
Multiplying by whole number powers of 10: Move the
decimal point one place to the right for each zero in
the whole number power 10.
7. Multiplying by
Powers of Ten
***Copy this in your notebook:
Multiplying by whole number powers of 10: Move the
decimal point one place to the right for each zero in
the whole number power 10.
Numbers 3.995 x 100 = 3.99.5
9. Multiplying by
Powers of Ten
***Copy this in your notebook:
10. Multiplying by
Powers of Ten
***Copy this in your notebook:
Multiplying by decimal number powers of 10: Move
the decimal point one place to the left for each zero in
the whole number power 10.
11. Multiplying by
Powers of Ten
***Copy this in your notebook:
Multiplying by decimal number powers of 10: Move
the decimal point one place to the left for each zero in
the whole number power 10.
Numbers 399.5 x 0.001 = 399.5
12. Try these on your own (in
your notebook)
Multiply decimals using mental maths:
0.05 x 1000 =
95.38 x 0.0001
14. Check your answer (in
your notebook)
Multiply decimals using mental maths:
15. Check your answer (in
your notebook)
Multiply decimals using mental maths:
0.05 x 1000 = 50
16. Check your answer (in
your notebook)
Multiply decimals using mental maths:
0.05 x 1000 = 50
Move the decimal 3 places to the right.
17. Check your answer (in
your notebook)
Multiply decimals using mental maths:
0.05 x 1000 = 50
Move the decimal 3 places to the right.
95.38 x 0.0001 = 0.009538
18. Check your answer (in
your notebook)
Multiply decimals using mental maths:
0.05 x 1000 = 50
Move the decimal 3 places to the right.
95.38 x 0.0001 = 0.009538
Move the decimal 4 places to the left.
21. Dividing by Powers
of Ten
*** Copy this in your notebook.
Dividing by Whole Number Powers of 10: Move the
decimal point one place to the left for each zero in the
whole number power of 10.
22. Dividing by Powers
of Ten
*** Copy this in your notebook.
Dividing by Whole Number Powers of 10: Move the
decimal point one place to the left for each zero in the
whole number power of 10.
35 ÷ 100 = 0.35. = 0.35
25. Dividing by Powers
of Ten
*** Copy this in your notebook.
Dividing by Decimal Number Powers of 10: Move the
decimal point one place to the right for each zero in
the whole number power of 10.
26. Dividing by Powers
of Ten
*** Copy this in your notebook.
Dividing by Decimal Number Powers of 10: Move the
decimal point one place to the right for each zero in
the whole number power of 10.
35 ÷ 0.001 = 35.00 = 3,500
27. Divide Decimals Using Mental
Math (Now you try: in your
notebook)
• 508.3 ÷ 10
• 508.3 ÷ 0.01
28. Divide Decimals Using Mental
Math (Now you try: in your
notebook)
• 508.3 ÷ 10 = 50.83
Move 1 place to the left.
• 508.3 ÷ 0.01 = 50,830
Move 2 places to the right.
29. Try these (show these problems tomorrow with
your homework)
• 6.07 X 1000
• 153.6 X 0.01
• 42.6 ÷ 100
• 509 ÷ 1000
• 5 ÷ 0.1
• 3.2 ÷ 0.001
