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? (1770) (716) Post / Read comment (2)

Advertisements

Siba Kumar Sahu (11 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

Like? Yes (13) | No (4)

mayank rawat (10 years ago)

sir i need amcat placement papers and tricks i can use to solve maximum of question accurately...if anyone else in the group have it..plz mail them to me at "makrawat31july@gmail.com"

Like? Yes | No (2)

Dimple

India

Punjab

Time: 00:01:33

Points

Maths Quotes

In mathematics you don't understand things. You just get used to them.

Johann von Neumann

Arithmetic is numbers you squeeze from your head to your hand to your pencil to your paper till you get the answer

Carl Sandburg

Placed User Comments

M4Math helped me a lot.

Vipul Chavan 4 years ago

Thanks m4 maths for helping to get placed in several companies.
I must recommend this website for placement preparations.

yash mittal 5 years ago

Multiplication of two numbers that differ by 6

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