**Subtracting Numbers
Near a Base**

**H.D. Motiramani**

Subtracting becomes very easy if we subtract any number that is 10 or multiple of 10. The technique therefore is to add a number to both the numbers in question so that one of them becomes 10 or multiple of 10. The point becomes clear only by way of examples.

Examples:

· 46 -27

Consider 27 is close to 30 (that is 3 below 30). So add 3 to both the numbers 46 as well as 27.

46 – 27

+3 +3

-----------------

= 49 - 30 = 19

· 84 – 39

Consider 39 is close to 40 that is 1 below 40

84 – 39 (Add 1 to both numbers)

+1 +1

------------------

= 85 – 40 = 45

· 96 – 37

Consider 37 is close to 40 that is 3 below 40

96 – 37

+3 +3

------------------

= 99 – 40 = 59

· 88 – 58 ( Add 2 to both numbers)

+2 +2

--------------------

= 90 – 60 = 30

Practicing the above with more and more such examples will help in putting this technique into play for all the time to come. That will lead is to faster calculation.

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