Add or subtract as indicated.
-$\frac { 3 } { 8 } - \frac { 1 } { 20 }$
A) $\frac { 1 } { 20 }$
B) $\frac { 13 } { 40 }$
C) $\frac { 13 } { 160 }$
D) $\frac { 7 } { 20 }$

Question

Quizplus · Accepted Answer

To subtract fractions, you need a common denominator. The least common multiple of 8 and 20 is 40. Convert each fraction: $\frac{3}{8} = \frac{15}{40}$ and $\frac{1}{20} = \frac{2}{40}$. Subtracting gives $\frac{15}{40} - \frac{2}{40} = \frac{13}{40}$.

Add or Subtract as Indicated 38−120\frac { 3 } { 8 } - \frac { 1 } { 20 }83​−201​

Add or Subtract as Indicated $\frac { 3 } { 8 } - \frac { 1 } { 20 }$