why in multiplication of fractions the whole number is multiplied with only numerator and not with the denominator ?

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Solution

$Dear Chaitree, When we are multiplying a number with fraction then numerator and denominator both are multiplied, i will show you how, Let the number is 3 and fraction is \frac{2}{5} now see the number 3 can also be expressed as, 3 = \frac{3}{1} and this \frac{3}{1} is same as 3 because dividing any number by 1 give you the same number so, when we are performing, 3 \times \frac{2}{5} it is same as \frac{3}{1} \times \frac{2}{5} = \frac{3 \times 2}{1 \times 5} = \frac{6}{5}$

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