Perform the indicated operation. Express your answer in simplest form.
-$$\frac { 5 } { 12 } - \frac { 1 } { 7 }$$
A) $\frac { 4 } { 19 }$
B) $\frac { 1 } { 21 }$
C) $\frac { 23 } { 84 }$
D) $\frac { 23 } { 19 }$

Question

Quizplus · Accepted Answer

To subtract fractions, you need a common denominator, which for 12 and 7 is 84. Convert each fraction: $ \frac{5}{12} = \frac{5 \times 7}{12 \times 7} = \frac{35}{84} $ and $ \frac{1}{7} = \frac{1 \times 12}{7 \times 12} = \frac{12}{84} $. Subtracting these gives $ \frac{35}{84} - \frac{12}{84} = \frac{23}{84} $.

Perform the Indicated Operation 512−17\frac { 5 } { 12 } - \frac { 1 } { 7 }125​−71​

Perform the Indicated Operation $\frac { 5 } { 12 } - \frac { 1 } { 7 }$