Perform indicated operation and simplify

5/8 + 7/10

5/8 + 7/10

25/40 + 28/40
53/40

Perform indicated operation and simplify 9/10 ÷ 18

I'll start.

9/(10*18)

To add fractions, you need to have a common denominator. In this case, the common denominator for 8 and 10 is 40.

To get the fractions to have the same denominator, you can multiply the numerator and denominator of the first fraction by 5, and the numerator and denominator of the second fraction by 4.

This gives:

(5/8) x (5/5) + (7/10) x (4/4)
= 25/40 + 28/40

Now that both fractions have a common denominator of 40, you can add them together:

25/40 + 28/40 = (25 + 28)/40 = 53/40

Therefore, the simplified answer is 53/40.