Answer: 9/10
The equation: 7/10 + 20/100 = 70/100 + 20/100 = 90/100 = 9/10
Explanation: You have to find the common denominator (which is a same bottom number) so you multiple 10 times 10 to get 100, giving us 7/100 + 20/100.
and now that you’ve got the same denominator you have to do what you did on the bottom to the top so now we need to multiply 7 (the top number) by 10, giving us 70 and we keep 20 the same because we kept that fraction the same
By now you just do normal addition
70/100 + 20/100 = 90/100 but we know we can simplify that to make it smaller and 10 can go into both of those numbers so (10 x 9 = 90 and 10 x 10 = 100) so we would have 9/10 as our final answer
Hope this helped :)