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

 


B
ehold 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

 

   

 

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