This document discusses multiplying decimals by powers of ten. It explains that multiplying a decimal by 10 moves the decimal point one place to the right, multiplying by 100 moves it two places to the right, and multiplying by 1000 moves it three places to the right. Examples are provided of multiplying various decimals by 10, 100, 1000 and 10,000 to demonstrate this pattern. Conversions between meters, decimeters, centimeters and millimeters are also explained.

1. Decimals
Multiplying Decimals by 10, 100, 1000, 10 000

2. Explore
 Kaiz plays on the SJA basketball team and is 2.007 m tall.
 How tall would Kaiz be in centimetres?

3. Explore
 Use the place value chart
 Use a calculator and place all products in the place value
chart
 38 x 10
16.2 x 10
9.04 x 10
 38 x 100
16.2 x 100
9.04 x 100
 38 x 1000
16.2 x 1000
9.04 x 1000
 What pattern do you see?
 What do you think would happen if you multiplied by 10 000?

4. Place Value Chart
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Decimal
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5. Explore
 Use mental math and check with a calculator
2.134 x 10
0.246 x 1000
7.028 x 100
25.489 x 1000
7.89 x 100
6 x 1000

6. Connect
 1m = 10 dm
 1m = 100 cm
 1m = 1000 mm
 If Gabe was 1.234 M tall, how tall would he be in dm? cm?
mm?
 Place the numbers in your place value chart.

7. Place Value Chart
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Decimal
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8. Multiplying by 10
 10 only has one 0.
 You can move the decimal point one place to the right

9. Multiplying by 100
 100 has two 0.
 You can move the decimal point two place to the right
 Do you see the pattern?

10. Questions?

11. In class work
 pg. 139 - # 1 - 7

12. Homework
 pg. 56 + 57