44×21=
When we have a multiplication of fractions, we multiply numerator by numerator and denominator by denominator:
4*1 = 4
4*2 8
We can reduce the result, so we get:
4:4 = 1
8:4 2
And thus we arrived at the result, one half.
Similarly, we can see that the first fraction (4/4) is actually 1, because when the numerator and denominator are equal it means the fraction equals 1,
and since we know that any number multiplied by 1 remains the same number, we can conclude that the solution remains one half.