Question

Add the numbers by suitable rearrangement 7 + 18 + 13​

Answer 1

All the operation are addition so there is no need to arrange in any manner
So
7+18+13
38

I hope this helps

Answer 2

Answer:

(13+7)+18

= 20+18

=38

( We added 13 and 7 in the bracket as their sum ends with a zero and it will be easier to calculate it ahead)

Hope it helps you.