Question

Rob's tablet is fully charged.He uses 1/12 of the charge playing games,5/12 of the charge reading and 3/12 completing homework.What fraction of the charge remains on Rob's tablet

Answer 1

All of the number already have the same denominator, which is 12 so you can just add them.

(1+5+3)/12=9/12

and subtract then from 1 = 12/12
(12-9)/12=3/12