B. 12/31+20/31+5/31 C. 3 1/2+4/9 D. 17/24-5/12 E. 8 1/4-7/8 F. 10 1/5-1 4/15

B. 12/31+20/31+5/31
C. 3 1/2+4/9
D. 17/24-5/12
E. 8 1/4-7/8
F. 10 1/5-1 4/15

B.
$frac{12}{31} + frac{20}{31} + frac{5}{31} \ = frac{12 + 20 + 2}{31} \ = frac{37}{31} \ = 1.194$
C.
$3 frac{1}{2} + frac{4}{9} \ = frac{3}{2} + frac{4}{9} \ = frac{35}{18} \ = 1.95$
D.
$frac{17}{24} - frac{5}{12} \ = frac{17 - 10}{24} \ = 0.3$
E.
$8 frac{1}{4} - frac{7}{8} \ = frac{8}{4} - frac{7}{8} \ = 2 - frac{7}{8} \ = frac{9}{8} \ = 1.125$
F.
$10 frac{1}{5} - 1 frac{4}{15} \ = frac{10}{5} - frac{4}{15} \ = 2 - frac{4}{15} \ = frac{26}{15} \ = 1.74$