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