Check your Change

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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