a. $\frac{5}{8}-\frac{2}{5}=\frac{25 - 16}{40}=\frac{9}{40}$
b. $1\frac{1}{10}-\frac{3}{4}=\frac{11}{10} -\frac{3}{4}= \frac{22}{20}- \frac{15}{20}=\frac{7}{20}$
c. $\frac{2}{3}+\frac{1}{2}-\frac{5}{6}= \frac{4+3 -5}{6}= \frac{2}{6}= \frac{1}{3}$
a. $\frac{5}{8}-\frac{2}{5}=\frac{25 - 16}{40}=\frac{9}{40}$
b. $1\frac{1}{10}-\frac{3}{4}=\frac{11}{10} -\frac{3}{4}= \frac{22}{20}- \frac{15}{20}=\frac{7}{20}$
c. $\frac{2}{3}+\frac{1}{2}-\frac{5}{6}= \frac{4+3 -5}{6}= \frac{2}{6}= \frac{1}{3}$