To add two fractions, we must first make them have a common denominator. In this case, we can create a common denominator of 10 for both of the fractions in order for us to add them together.
In the fraction 40/100, if we divide both the numerator and the denominator by their shared factor of 10, we can simplify this fraction.
(40/10) / (100/10) = 4/10
Therefore, if we substitute this value in for our original fraction 40/100, we can add our two fractions together, as follows:
4/10 + 2/10 (add the numerators and keep the same denominator) = 6/10
However, 6/10 isn't in simplest form because we can divide both the numerator and the denominator of this fraction by 2 to simplify it.
(6/2) / (10/2) = 3/5
Therefore, your answer is 3/5.
Hope this helps!