ANSWER
5/10 and 4/10
Step-by-step explanation
We want to enter fractions given as a pair of fractions that have the same denominator.
The fractions given are:
1/2 and 2/5
To do that, we have to first find the lowest common multiple of the two denominators.
The denominators are:
2 and 5
Their lowest common denominator is 10, since it is the smallest number which is divisible by both numbers.
To put the first fraction in terms of a denominator of 10, we have to multiply the numerator and denominator by 5.
That is:

To put the second fraction in terms of a denominator of 10, we multiply the numberator and denominator by 2.
That is:

Therefore, the two fractions in terms of a common denominator are 5/10 and 4/10.