Question

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Answer 1

1) 4/15+3/4=61/60
2) 5/6-9/14=8/42=4/21
3) 4 4/7+6 1/4=10 23/28
4) 5 7/8-3 5/6=2 1/24

Answer 2

$1) : : : frac{4}{15} + frac{3}{4} = frac{4 times 4 + 3 times 15}{60} = frac{16 + 45}{60} = frac{61}{60} = 1 frac{1}{60} \ 2) : : : frac{5}{6} - frac{9}{14} = frac{7 times 5 - 3 times 9}{42} = frac{35 - 27}{42} = frac{ 8 }{42} = frac{4}{21}$
$3) : : : 4 frac{4}{7} + 6 frac{1}{4} = 4 + 6 + frac{4 times 4 + 7}{28} = 10 frac{16 + 7}{28} = 10 frac{23}{28} \ 4) : : : 5 frac{7}{8} - 3 frac{5}{6} = 5 - 3 + frac{7 times 3 - 5 times 4}{24} = 2 frac{21 - 20}{24} = 2 frac{1}{24}$