Quantitative Aptitude Shortcut Trick-Multiplying numbers just over 100

Multiplying numbers just over 100.

108 x 109 = 11772

The answer is in two parts: 117 and 72,

117 is just 108 + 9 (or 109 + 8),

and 72 is just 8 x 9.

Similarly 107 x 106 = 11342

                109 x 105 = 11445

                102 x 108 = 11016

                105 x 115 = 12075

                105 x 108 = 11340

                109 x 102 = 11118

                     

HOW USEFUL IS THIS CALCULATION!

EXAMPLE:

Compute the amount and the compound intrest on Rs 10000.00 on 2.years at4%per annum.

Now 4x4=16 and 4+4=8 put 10 it becomes Rs 10816.00

How simple ! no calculation no extra time !

Practice Set

Solve mentally these questions

Note down your calculation time by watch

(Suggested time 90 seconds)

102 X 102            103 X 105              108 X 104

101 X 102            102 X 103              103 X 104

104 X 105            105 X 106              107 X 108

108 X 109            109 X 109              107 X 107

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