Transcript place values - TeacherTube

Multiplying and Dividing by
powers of ten
100
10
1000
10
100
http://hench-maths.wikispaces.com
10,000 1000 100 10' s
1' s
5 3 7
1
ths
10
1
1
ths
ths
100
1000
4 8
2
What are the
PLACE
VALUES of the
digits in this number?
10,000 1000 100 10' s
1' s
5 3 7
1
ths
10
1
1
ths
ths
100
1000
4 8
2
So that means
2
4
8
500 + 30 + 7 + 10 + 100 + 1000
10,000 1000 100 10' s
1' s
5 3 7
1
ths
10
1
1
ths
ths
100
1000
4 8
2
The decimal point
just separates the whole
numbers from the decimal
fractions
10,000 1000 100 10' s
1' s
5 3 7
1
ths
10
1
1
ths
ths
100
1000
4 8
2
What happens when I
multiply this number by
10 ?
10,000 1000 100 10' s
1' s
5 3 7
1
ths
10
1
1
ths
ths
100
1000
4 8
2
Each digits value will
become 10 times bigger so
the digits move LEFT into
the next column
Multiplying by 10
537.482 x 10 = 5374.82
It LOOKS like the decimal
point moves one place to
the right. (and that is how
many teachers ask you to
think of it)
Multiplying by 10
Moving the digits one place to
the LEFT looks the same as
moving the decimal point one
place to the RIGHT.
5 3 7
4 8
2
5 3 7
4 8
2
More Multiplying and Dividing
Digits Move
x10
One place to LEFT
( LOOKS LIKE )
Decimal Point Moves
One place to RIGHT
x100 Two places to LEFT
Two places to RIGHT
÷ 10
One place to LEFT
One place to RIGHT
÷ 100 Two places to RIGHT Two places to LEFT
I hope I haven’t LEFT
Thanks
you
confusedfor
but I
thought
we should get
watching.
this RIGHT
WEB LINKS
• BBC Skillwise
• Primary Resources