CPM Homework Help : CC1 Problem 3-48

Which of the following fractions could you add together easily? Explain.

$\frac { 5 } { 7 }$ , $\frac { 2 } { 3 }$ , $\frac { 1 } { 4 }$ , $\frac { 4 } { 3 }$ , $\frac { 7 } { 5 }$ , $\frac { 1 } { 2 }$ , $\frac { 9 } { 10 }$ , $\frac { 1 } { 5 }$ , $\frac { 5 } { 6 }$ , $\frac { 1 } { 7 }$ , $\frac { 2 } { 2 }$

Hint:

Fractions are easiest to add together when they have the same denominator. Which fractions share denominators? Which fractions could be easily converted so that they have common denominators?