Multiplication of two numbers that differ by 6

Maths Tricks , short cut tricks for maths to make calculation easy and fast

Multiplication of two numbers that differ by 6 If the two numbers differ by 6 then their product is the square of their average minus 9. Let me explain this rule by taking examples 10*16 = 13^2 - 9 = 160 22*28 = 25^2 - 9 = 616: Example.
Understand the rule by 1 more example
997*1003 = 1000^2 - 9 = 999991; Is this maths trick helpful? (1766) (715) Post / Read comment (2)

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Siba Kumar Sahu (9 years ago)

the formula here used is (x-a)*(x+a)=x^2-a^2
in the example X= average no = 1000
a = 3 so (x-a)*(x+a) = (1000-3)*(1000+3) = 997*1003
=1000^2-3^2
=1000^2-9 = 999991

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mayank rawat (8 years ago)

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Dimple

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Multiplication of two numbers that differ by 6

Maths Tricks , short cut tricks for maths to make calculation easy and fast