Question

a, 1/2 - 1/3             b, 1/5 - 1/7        c, 7/9 - 2/5 

d, 1/2 + 1/3             e, 2/5 + 1/4 + 1/3     g,17/42 + 3/7

h, 16/17 - 12/13

Answer 1

`1/2 -1/3= 3/6 -2/6=1/6`

`1/5 -1/7= 7/35 - 5/35=2/35`

`7/9 -2/5= 35/45 - 18/45=17/45`

`1/2 + 1/3 = 3/6 + 2/6= 5/6`

`2/5 + 1/4 + 1/3 = 24/60 + 15/60 + 20/30=59/30`

`17/42 + 3/7= 17/42 + 18/42=35/42=5/6`

`16/17 - 12/13=4/221`

Answer 2

`a)1/2-1/3`

`=3/6-2/6`

`=1/6`

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`b)1/5-1/7`

`=7/35-5/35`

`=2/35`

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`c)7/9-2/5`

`=35/45-18/45`

`=17/45`

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`d)1/2+1/3`

`=3/6+2/6`

`=5/6`

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`e)2/5+1/4+1/3`

`=24/60+15/60+20/60`

`=59/60`

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`g)17/42+3/7`

`=17/42+18/42`

`=35/42`

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`h|)16/17-12/13`

`=208/221-204/221`

`=4/221`

Answer 3

`a, 1/2 - 1/3  = 3/6 - 2/6 = 1/6 `           

 

`b, 1/5 - 1/7 = 7/35 - 5/35 = 2/35 `       

 

`c, 7/9 - 2/5 = 35/45 - 18/45 = 17/45`

 

`d, 1/2 + 1/3= 3/6 + 2/6 = 5/6 `           

 

` e, 2/5 + 1/4 + 1/3 = (24+15+20)/60 = 59/60`   

 

`g,17/42 + 3/7 = 17/42 + 18/42 = 35/42`

 

`h, 16/17 - 12/13= 208/221 - 204/221 = 4/221`

Answer 4

\(a,\dfrac{1}{2}-\dfrac{1}{3}=\dfrac{3}{6}-\dfrac{2}{6}=\dfrac{1}{6}\)

\(b,\dfrac{1}{5}-\dfrac{1}{7}=\dfrac{7}{35}-\dfrac{5}{35}=\dfrac{2}{35}\)

\(c,\dfrac{7}{9}-\dfrac{2}{5}=\dfrac{35}{45}-\dfrac{18}{45}=\dfrac{17}{45}\)

\(d,\dfrac{1}{2}+\dfrac{1}{3}=\dfrac{3}{6}+\dfrac{2}{6}=\dfrac{5}{6}\)

\(e,\dfrac{2}{5}+\dfrac{1}{4}+\dfrac{1}{3}=\dfrac{8}{20}+\dfrac{5}{20}+\dfrac{1}{3}=\dfrac{13}{20}+\dfrac{1}{3}=\dfrac{39}{60}+\dfrac{20}{60}=\dfrac{59}{60}\)

\(g,\dfrac{17}{42}+\dfrac{3}{7}=\dfrac{17}{42}+\dfrac{18}{42}=\dfrac{35}{42}\)

\(h,\dfrac{16}{17}-\dfrac{12}{13}=\dfrac{208}{221}-\dfrac{204}{221}=\dfrac{4}{221}\)