Add. Do not use a number line except as a check.
-$$- \frac { 5 } { 14 } + \frac { 16 } { 21 }$$
A) $\frac { 17 } { 42 }$
B) $\frac { 11 } { 21 }$
C) $\frac { 19 } { 21 }$
D) $\frac { 17 } { 21 }$

Question

Quizplus · Accepted Answer

To add the fractions, find a common denominator. The least common multiple of 14 and 21 is 42. Convert each fraction: $-\frac{5}{14} = -\frac{15}{42}$ and $\frac{16}{21} = \frac{32}{42}$. Add them: $-\frac{15}{42} + \frac{32}{42} = \frac{17}{42}$.

Add Do Not Use a Number Line Except as a Check