Transcript Long Multiplication Traditional Method Long Multiplication (traditional) This method has been used in the United Kingdom for generations. Even your Grandparents will remember this method. Long Multiplication (traditional) First multiplying.

Long Multiplication
Traditional Method
Long Multiplication
(traditional)
This method has been used in the
United Kingdom for generations.
Even your Grandparents will
remember this method.
Long Multiplication
(traditional)
First multiplying two 2 digit numbers to get
an idea of how the system works.
46 x 33
Follow carefully the method keeping digits
in the correct columns. Numbers MUST
be kept under each other to maintain
“Place Value”.
Example 46 x 33
4
3
11 31
11 31 8
6
3
8
0
1 51 1
8
Remember to carry
over any “tens”
x
This line is 46 x 3
This line is 46 x 30
Now add these two rows to
get the answer!!!
Not too hard I hope.
Now to multiply 3 digit number by
another 3 digit number.
237 x 412
The same rules apply…
237 x 412
2 3 7
4 1 2
4 71 4
2 3 7 0
91 42 8 0 0
9 71 61 4 4
x
Remember to carry over
the ‘tens’ (in black!!)
237x2
237x10
237x400
Now add the rows together
This method can also be used to
multiply decimal numbers together.
The easiest way is to ignore the decimal
points in the first instance and do a
multiplication as the previous slides.
THEN work out where to put in the
decimal point. (If the answer contains
any final zeros KEEP them.)
Example 2.37 x 41.2
237 x 412 = 97644
From the previous worked
example
Looking at the problem, there are three
places in total after the decimal points.
Therefore we put the decimal point in the
answer three places to the left giving:
97.644