Multiply any number by 5 mentally

https://www.youtube.com/watch?v=rqymPFil-So

5=10/2

If we want to multiply any number by 5 then multiply by 10 and divide by 2. This concept makes multiplication of bigger numbers easier.

To multiply any number by 10, you put 0 at the end of the number

Ex 23 X 10=230

456 X 10=4560

Then divide by 2.

Ex 21 X 5

= 21*10/2

=210/2

=105

 

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