Dividing any number by 5 mentally

https://www.youtube.com/watch?v=XwzK68l0hJo

Dividing any number by 5 can be made easy  by multiplying and dividing by 2.

Multiplying and dividing by same number does not change the value of the original number.

Multiplying by 2 is same as doubling the number .

16/5

=16/5 X 2/2

=32/10

=3.2

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