Multiplication
Grid Method
To teach multiplication, one of the methods we use is the
grid method. We partition the numbers up into hundreds,
tens and units (or ones) and then use a grid to multiply
each of the separate parts. It sounds more complicated
than it is!
there are 4 digits here
which means you
e.g. 23 x 15
will need to do 4
multiplications
10
5
20
(20 x 10)
3
(3 x 10)
200
30
(20 x 5)
(3 x 5)
100
15
Now just add all the numbers in the grid!
so 23 x 15 = 200 + 100 + 30 + 15
= 345
For larger numbers just use a bigger grid!
Multiplying by 10, 100 or 1000
Multiplying by 4
The digits move 1, 2 or 3 places Double and double again
to the left
4.56 x 10 = 45.6
13 x 4
4.56 x 100 = 456
double 13 = 26
4.56 x 1000 = 4560
double 26 = 52