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Using BY SUBTRACTION AND BY ADDITION you<br />
can easily check your change.<br />
Suppose you offer 50p for something costing 18p.<br />
� 50 - 18 = 32<br />
www.classtopper.com<br />
CHECK YOUR CHANGE<br />
To take 18 from 50, we note that 18 is close to<br />
20, so we take 20 away from 50 (to get 30) and<br />
add 2 back on.<br />
32
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