d) $\frac{1}{4}$ + $\frac{5}{12}$ + $\frac{1}{13}$ - $\frac{7}{8}$
=$\frac{1*78}{4*78}$ + $\frac{5*26}{12*26}$ + $\frac{1*24}{13*24}$ - $\frac{7*39}{8*39}$
= $\frac{78}{312}$ + $\frac{130}{312}$ + $\frac{24}{312}$ - $\frac{273}{312}$
= $\frac{78+130+24-273}{312}$
= $\frac{-41}{312}$
e) $\frac{11}{36}$ - $\frac{-8}{36}$ = $\frac{11}{36}$ + $\frac{8}{36}$
= $\frac{11+8}{36}$
= $\frac{19}{36}$
f) $\frac{-5}{9}$ - $\frac{-7}{12}$ = $\frac{-5}{9}$ + $\frac{7}{12}$
= $\frac{-5*4}{9*4}$ + $\frac{7*3}{12*3}$
= $\frac{-20}{36}$ + $\frac{21}{36}$
= $\frac{-20+21}{36}$
= $\frac{1}{36}$
