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UNIT 1

Multiply and divide any positive integer up to 10

000 by 10 or 100 and understand the effect.

Decimals

Multiply Divide by 10, 100, 1000

Level E

Learning Intention

Success Criteria

1. To understand how to multiply and divide

decimal numbers by 10, 100, 1000.

- Understand the simple rules to multiply and

divide decimal numbers.

2. Be able do calculations.

3. To understand the effect.

Sunday, 30 August 2009

DiscoveringTime

The effect of multiplying a number by 10, 100,

1000 10000

6

6x1

six

0

6

sixty

6x10

0

6

0

six hundred

6x100

6x1000

6

0

0

0

six thousand

6

0

0

0

0

6x10000

sixty thousand

What is happening ?

The effect of dividing a number by 10, 100, 1000

10000

Level E

7

seven

7

0

nought point seven

0

7

nought point nought seven

0

nought point nought nought seven

0

0

0

7

What is happening ?

Level E

Multiplying a whole number by 10

Example

add place holder zero to the units column

2

4

6

0

246 x 10 2460

all digits move one place to the left

Level E

Multiplying a decimal by 100

Example

4

2

9

4

0

6

add place holder zeros to the units columns

629.4 x 100 62940

all digits move two places to the left

Decimals

Multiply Divide by 10, 100, 1000

Level E

To multiply a decimal number by 10, Simply move

all digits 1 place to the left

e.g. 2.55 x 10 25.5 digits are moved 1 place

to left

To multiply a decimal number by 100, Simply move

all digits 2 places to the left

e.g. 1.02 x 100 102.0 digits are moved 2

places to left

DiscoveringTime

Sunday, 30 August 2009

Decimals

Multiply Divide by 10, 100, 1000

Level E

To multiply a decimal number by 1000, Simply

move all digits 3 places to the left

e.g. 34.567 x 1000 34 567 digits are moved

3 places to left

DiscoveringTime

Sunday, 30 August 2009

Level E

Multiplying a whole number by 100

Example

add place holder zeros to the units tens columns

3

5

0

0

9

935 x 100 93500

all digits move two places to the left

Level E

Multiplying a decimal by 100

Example

7

3

1

7

0

4

add place holder zeros to the units columns

431.7 x 100 43170

all digits move two places to the left

Level E

Dividing a whole number by 10

Example

6

8

7

all digits move one place to the right

Level E

Dividing a whole number by 100

Example

8

6

7

all digits move two places to the right

As the following numbers appear multiply them by

10.

1.92

0.638

6.75

12.82

1.4

As the numbers appear multiply by 100.

0.67

16.8

2.5

8.324

1.56

Level E

Plenary

Sunday, 30 August 2009

(No Transcript)

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