CHECK YOUR CHANGE
Using BY SUBTRACTION AND BY ADDITION you
can easily check your change in the shop.
Suppose you offer 50 cents for something costing 18 cents.
- 50 - 18 = 32
To take 18 from 50, we note that 18 is close to
20, so we take 20 away from 50 (to get 30) and
add 2 back on. - Similarly in 73 - 49 we decide to take 50 away
from 73 and then add 1 back on. We get 24.
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Check Your Change
Behold the heaven, the earth, the sea; all that
is bright in them or above them; all that creep
or fly or swim; all have forms because all
have number. Take away number and they will
be nothing...
ST AUGUSTINE
