Question

Answer 1

a: =12/28+7/28=19/28

b: =49/70+30/70=79/70

c: =32/24-21/24=11/24

d: =4/9

Answer 2

a \(\dfrac{12+7}{28}=\dfrac{19}{28}\)

b\(\dfrac{49+30}{70}=\dfrac{79}{70}\)

c \(\dfrac{32-21}{24}=\dfrac{11}{24}\)

d \(\dfrac{9-5}{9}=\dfrac{4}{9}\)

Answer 3

\(a,\dfrac{3}{7}+\dfrac{1}{4}=\dfrac{12}{28}+\dfrac{7}{28}=\dfrac{19}{28}\)

\(b,\dfrac{7}{10}+\dfrac{3}{7}=\dfrac{49}{70}+\dfrac{30}{70}=\dfrac{79}{70}\)

\(c,\dfrac{4}{3}-\dfrac{7}{8}=\dfrac{32}{24}-\dfrac{21}{24}=\dfrac{11}{24}\)

\(d,1-\dfrac{5}{9}=\dfrac{9}{9}-\dfrac{5}{9}=\dfrac{4}{9}\)

Answer 4

\(\dfrac{2}{7}+\dfrac{1}{4}=\dfrac{19}{28}\)

\(\dfrac{7}{10}+\dfrac{3}{7}=\dfrac{79}{70}\)

\(\dfrac{4}{3}-\dfrac{7}{8}=\dfrac{11}{24}\)

\(\dfrac{1}{1}-\dfrac{5}{9}=\dfrac{4}{9}\)