Making Your Math Simple
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IMPROVING YOUR CALCULATING SPEED
Applying Tactics in Multiplication
While multiplying, we may also use certain tactics to find the answer quickly.
Example 1
89 x 8 For making the above calculation simple we may do as mentioned below
89 x 8 = (90 -1) x 8 = 720 – 8 = 712.
But avoid bifurcating a number using minus sign as far as possible. The above example can also be solved as follows:
89 x 8 = (80 + 9) x 8 Now we have used “80+9” in place of “90-1” = 640 + 72 = 712
Example 2
65 x 12 = (60 + 5) x 12 = 720 + 60 = 780.
OR
65 x 12 = 65 x (10+2) = 650+130 = 780
Example 3
34 x 9 = (30 + 4) x 9 = 270 + 36 = 306
Example 4
312 x 14 = (300 + 10 +2) x 14 = 4200+140+28 = 4368
With a little practice you will be devising your own ways of such manipulations to get the answer quickly and accurately.
The above mentioned methods make the things simpler and more accurate, the only thing required is applying these tactics regularly while doing such calculations. So start using this method in your real life to improve your calculating speed.
for more such tricks and tactics to make your math simpler, please logon to http://www.magicwithmath.com
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