Transcript Finding Percentages

Multiplication
methods
Multiplying

Multiplication is mainly taught in three ways - the grid method, Chinese
multiplication and traditional column method.

The Grid Method involves breaking the number up into hundreds, tens,
units etc. Multiplying them together and then adding the answers.
E.g. : 34 x 65
Break the 34 into 30 and 4,
similarly break 65 into 60 and 5
30
60
5
4
Next…..
…. multiply the numbers together
( e.g. 30 x 60 = 1800)
30
3 x 6 = 18, then add 2 zeros
4
60
1800
240
5
150
20
finally add the answers
1 8 0 0
2 4 0
1 5 0
1
1
2 0
2 2 1 0
Chinese multiplication is set out similarly to the
grid method but it has the bonus of never having
to multiply numbers higher than 9x9.
E.g. 34 x 65
3
4
6
Multiply the numbers together,
placing
the tens above the diagonal line
and
units underneath.
5
3
4
1
2
8
1
4
2
5
0
6
5
Next…..
…... add together the numbers on the diagonals.
3
So, 34 x 65 = 2210
2
2
4
2
1
1
8
1
1
4
2
5
1
0
0
6
5
Or the more traditional column method
can be used
First multiply the 34 by 5
3 4
x 6 5
1 7 0
Then multiply the 34 by 60, this can be done by adding a 0 and
multiplying by 6
3 4
x 6 5
1 7 0
2 0 4 0
Finally add the two answers
3 4
x 6 5
1 7 0
+
2 0 4 0
2 2 1 0