Question

calculate the sum of 1/4 and 1/7

Answer 1

Okay, first you need to find a common denominator.

For 4 and 7 that would be 28.
So, now multiply the numerator and denominator by the same number.
1/4 times 7/7, so that it stays the same.
1/7 times 4/4.
You should get 7/28+4/28
Add the numerators; 11
Your answer should be 11/28. :D