Question

Answer 1

1/

a) \(\dfrac{2}{7}+\dfrac{5}{7}=\dfrac{7}{7}=1\)

b) \(\dfrac{4}{9}+\dfrac{15}{9}+\dfrac{8}{9}=\dfrac{27}{9}=3\)

c) \(\dfrac{2}{8}+\dfrac{5}{4}=\dfrac{2}{8}+\dfrac{10}{8}=\dfrac{12}{8}=\dfrac{3}{2}\)

d) \(\dfrac{2}{7}+\dfrac{5}{3}=\dfrac{6}{21}+\dfrac{35}{21}=\dfrac{41}{21}\)

e) \(\dfrac{7}{4}+\dfrac{5}{16}=\dfrac{28}{16}+\dfrac{5}{16}=\dfrac{32}{16}=2\)

g) \(\dfrac{18}{12}+\dfrac{4}{8}=\dfrac{144}{96}+\dfrac{48}{96}=\dfrac{192}{96}=2\)

Answer 2

a) 2/ 7 + 5/ 7 = 2 + 5/ 7 = 7/ 7 = 1

b) 4/ 9 + 15/ 9 + 8/ 9 = 4 + 15 + 8/ 9 = 27/ 9 = 3

c) 2/ 8 + 5/ 4 = 8/ 32 + 40/ 32 = 48/ 32 = 3/ 2

d) 2/ 7 + 5/ 3 = 6/ 21 + 35/ 21 = 41/ 21

e) 7/ 4 + 5/ 16 = 28/ 16 + 5/ 16 = 33/ 16

g) 18/ 12 + 4/ 8 = 3/ 2 + 4/ 8 = 12/ 8 + 4/ 8 = 16/ 8 = 2

Answer 3

a) 49+159+89=279=349+159+89=279=3

c) 27+53=621+3521=412127+53=621+3521=4121

e) 1812+48=14496+4896=19296=2