What is 1 over 7 plus 2 over 3 in simplest form?

Answer 1

1/7 + 2/3 (the common denominator is 21)

= (1 x 3)/(7 x 3) + (2 x 7)/(3 x 7)

= 3/21 + 14/21

= (3 + 14)/21

= 17/21, which is in its simplest form since both the numerator and the denominator do not have other common factors than 1.