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? (1259) (411) Post / Read comment (0)

Dimple

India

Punjab

Time: 00:01:33

Points

People do not make any mistake when they say life is a mathematics but they make blunder when they think mathematics is merely a calculation.

Chandan

Do you know what seems ODD to me? Those numbers which are not divisible by 2.

Inolas

M4Math helped me a lot.

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yash mittal 3 years ago