Question

efetue as adições e subtrações no caderno
a) 4/7 + 2/7
b) 8/5 - 3/5
c) 3/10 + 1/4
d) 4/5 - 2/3
e)1 3/10
f)3/25 + 2/5
g)3/4 + 4/5 - 3/10
h)5/8 - 3/8 - 1/8​

Answer 1

$a) \frac{4}{7} + \frac{2}{7} = \frac{4 + 2}{7} = \frac{6}{7}$

$b) \frac{8}{5} - \frac{3}{5} = \frac{8 - 3}{5} = \frac{5}{5} = 1$

$c) \frac{3}{10} + \frac{1}{4} = \frac{6 + 5}{20} = \frac{11}{20} = 0.55$

$d) \frac{4}{5} - \frac{2}{3} = \frac{12 - 10}{15} = \frac{2}{15}$

$e)1 \frac{3}{10} = \frac{1 \times 10 \times 3}{10} = \frac{10 + 3}{10} = \frac{13}{10}$

$f) \frac{3}{25} + \frac{2}{5} = \frac{3 + 10}{25} = \frac{13}{25} = 0.52$

$g) \frac{3}{4} + \frac{4}{5} - \frac{3}{10} = \frac{15 + 16 - 6}{20} = \frac{25}{20} = \frac{5}{4}$

$h) \frac{5}{8} - \frac{3}{8} - \frac{1}{8} = \frac{5 - 3 - 1}{8} = \frac{1}{8} = 0.125$