Question

d) (+1/2)+(-2/3)
e) (-3/4)+(+1/6)
f) (-2/5)+(+3/10)
g) (-5/6)+(+1/2)
h) (-5/8)+(-3/4)
j) (-4/7)+(+3/14)

Answer 1

d) (+1/2)+(-2/3) =
= 1/2 - 2/3 =
= 3/6 - 4/6 =
= - 1/6

e) (-3/4)+(+1/6) =
= - 3/4 + 1/6 =
= -3×3/12 + 2/12 =
= -9/12 + 2/12 =
= - 7/12

f) (-2/5)+(+3/10) =
= -2/5 + 3/10 =
= -2×2/10 + 3/10 =
= -4/10 + 3/10 =
= - 1/10

g) (-5/6)+(+1/2) =
= -5/6 + 1/2 =
= -5/6 + 3/6 =
= - 2 /6 =
= -1/3

h) (-5/8)+(-3/4) =
= - 5/8 - 3/4 =
= - 5/8 -3×2/8 =
= -5/8 - 6/8 =
= -11/8

j) (-4/7)+(+3/14) =
= - 4/7 + 3/14 =
= -4×2/14 + 3/14 =
= - 8 /14 + 3/14 =
= - 5/14