Multiplication of two numbers that differ by 2

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

Multiplication of two numbers that differ by 2 (This trick only works if you have memorised or can quickly calculate the squares of numbers. When two numbers differ by 2, their product is always the square of the number in between these numbers minus 1.Let me explain this rule by taking examples 18*20 = 19^2 - 1 = 361 - 1 = 360 25*27 = 26^2 - 1 = 676 - 1 = 675: Example.
Understand the rule by 1 more example 49*51 = 50^2 - 1 = 2500 - 1 = 2499; Is this maths trick helpful? (1260) (412) Post / Read comment (0)

Dimple

India

Punjab

Time: 00:01:33

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Maths Quotes

The difference between a two-digit number and the number obtained by interchanging the digits is 36. What is the difference between the sum and the difference of the digits of the number if the ratio between the digits of the number is 1 : 2 ?

frank

Old math teachers never die, they just tend to infinity.

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Multiplication of two numbers that differ by 2

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