Numeracy Worksheet - Castlebrae Community High School - 2012 Page 11
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47FHS Numeracy
Multiplication
contents page
Written Method
Example 5
Multiply 246 by 8
Level 2
2 4 6
Remember to ADD the carry.
x
8
4
3
1 9 6 8
Example 6
Multiply 4367 by 50
Level 3
4 3 6 7
x 50 is the same as x 5 x 10
x
5 0
(x 10)
Put the 0 into the answer first
1
3
3
then multiply by 5
2 1 8 3 5 0
Example 7
Multiply 472 by 300
Level 3
x 300 is the same as x 3 x 100
4 7 2
(x 100)
Put two 0’s into the answer first
x
3 0 0
then multiply by 3
2
1 4 1 6 0 0
Long Multiplication
We can multiply by a 2 or 3 digit number by combining the above
methods.
We can multiply by 52 if we split x52 into x2
Example 8
Multiply 5246 by 52
and x50.
Level 3
5 2 4 6
x
5 2
1
1 0 4 9 2
x2
1
2
3
To get the final answer add the two previous answers
2 6 2 3 0 0
+
x50
together. (50 + 2 = 52)
2 7 2 4 9 2
x52
Alternatively we could set it out as follows:
5 2 4 6
5 2 4 6
1 0 4 9 2
x
2
x
5 0
+ 2 6 2 3 0 0
1
3
3
1
2
3
2 1 8 3 5 0
2 6 2 3 0 0
2 7 2 4 9 2
x2
x50
x52
11
L Watson 2012
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