Title: Multiply and divide any positive integer up to 10 000 by 10 or 100 and understand the effect.
1UNIT 1
Multiply and divide any positive integer up to 10
000 by 10 or 100 and understand the effect.
2Decimals
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
3The 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 ?
4The 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 ?
5Level 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
6Level 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
7Decimals
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
8Decimals
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
9Level 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
10Level 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
11Level E
Dividing a whole number by 10
Example
6
8
7
all digits move one place to the right
12Level E
Dividing a whole number by 100
Example
8
6
7
all digits move two places to the right
13As 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
14Level E
Plenary
Sunday, 30 August 2009
15(No Transcript)