Question

how can we add a whole number to a fraction

Answer 1

you should multiply whole number by denominator of the fraction and add it to the numerator of the fraction .for example
2+1/2
2×2
―––
2

4
--
2

that is 2

Answer 2

let whole number be x
let fractional number be1/x
=x + 1/x
=(x^2 + 1)÷x