Leah ran 5/7 of a lap and ryan ran 2/3 of a lap. who ran farther and by how much?

Leah, she ran farther by 1/21

How you get the

5/7
Multiply 7x3 to get the denominator and do the same to the numerator 5x3! Which is 15/21
To get 21 from 2/3 is to multiply 3x7 (denominator) and 2x7 (numerator) to get 14/21

15/21 > 14/21 so Leah ran farther by 1/21