1. UNIT 1
Multiply and divide any positive integer up to by 10 or 100 and understand the effect.

2. Decimals Multiply & Divide by 10, 100, 1000 Learning Intention
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

3. The effect of multiplying a number by 10, 100, 1000 & 10000
ten thousands
thousands
hundreds
tens
units
6x1 6
six
6x10 6
sixty 6
6x100
six hundred
6x1000 6
six thousand
6x10000 6
sixty thousand
What is happening ?

4. The effect of dividing a number by 10, 100, 1000 & 10000
Decimal points
units
tenths
hundredths
thousandths
Level E
7 1 7
seven 7
nought point seven 7
nought point nought seven 7
nought point nought nought seven
What is happening ?

5. Level E
Multiplying a whole number by 10
Example 2 4 6 x 1
thousands
hundreds
tens
units 2 4 x 10 6 2 4 6
add place holder zero to the units column =
246 x 10 = 2460
all digits move one place to the left

6. Level E
Multiplying a decimal by 100
Example 6 2
9 4 x 1
tenths
ten thousands
thousands
hundreds
tens
units
Decimal point 6 2 x
100 9 4 6 2 9 4 =
add place holder zeros to the units columns
629.4 x 100 = 62940
all digits move two places to the left

7. 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 x 10 = 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 x 100 = digits are moved 2 places to left
DiscoveringTime
Sunday, 30 August 2009

8. 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 x 1000 =
digits are moved 3 places to left
DiscoveringTime
Sunday, 30 August 2009

9. Level E
Multiplying a whole number by 100
Example 9 3 5 x 1
ten thousands
thousands
hundreds
tens
units 9 3 x
100 5 9 3 5
add place holder zeros to the units & tens columns =
935 x 100 = 93500
all digits move two places to the left

10. Level E
Multiplying a decimal by 100
Example 4 3
1 7 x 1
tenths
ten thousands
thousands
hundreds
tens
units
Decimal point 4 3 x
100 1 7 4 3 1 7 =
add place holder zeros to the units columns
431.7 x 100 = 43170
all digits move two places to the left

11. Level E
Dividing a whole number by 10
Example
hundreds
tens
units
Decimal point
tenths 7 8 10 6 6 7 8 =
= 78.6
all digits move one place to the right

12. Level E
Dividing a whole number by 100
Example
hundreds
tens
units
Decimal point
tenths
hundredths 7 8
100 6 7 8 6 =
= 7.86
all digits move two places to the right

13. 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

14. Level E
Plenary
Sunday, 30 August 2009