Numeracy Worksheet - Castlebrae Community High School - 2012 Page 7
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47FHS Numeracy
contents page
Subtraction
Mental Strategies
There are a number of useful mental strategies for subtraction.
Some examples are given below.
Example 1
Calculate 93 - 56
Level 2
Method 1
Count on
Count on from 56 until you reach 93. This can be done in several ways
e.g.
4
30
3
= 37
56
60
70
80
90
93
Method 2
Break up the number being subtracted
e.g. subtract 50, then subtract 6
93 - 50 = 43
43 - 6 = 37
6
50
37
43
93
Start
7
L Watson 2012
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