Question

calcule 2/5+7/3 b-) 12/5-7/60. c-) 2/3 × 4/7. d) 3/2× 7/3 e) 1/2+3/2

Answer 1

a) 2/5+7/3 = mmc = 15
    3.2/15 + 5.7/15 =
    6 + 35 / 15 = 
    41 / 15

b) 12/5 - 7/60 =
     5.12/60 - 1.7/60 =
     60/60 - 7/60 =
     60 - 7 / 60 =
     53/60

c) 2/3 × 4/7 = 
    7.2/21 x 3.4/21 =
    14 x 12/21 =
     168 / 21 = 8 
 
d) 3/2× 7/3
    3.3/6 x 2.7/6 =
    9/6 x 14/6 =
    9 x 14/6 =
    126/6 = 21 

e) 1/2+3/2 = 
     1 + 3/2 =
     4/2 = 2