Question

1) 5/21 + 10/21 + 23/21 + 4/21

2) 93/120 - 83/150

3) 8/9 ÷ 4/3

4) 90/15 X 41/108 X 34/82

Answer 1

5/21 + 10/21 + 23/21 + 4/21 = 42/21

93/120 - 83/150 = 465/600 - 332/600 = 133/600

8/9 ÷ 4/3 = 8/9 × 3/4 = 2/3

90/15 × 41/108 × 34/82 = 17/18

Answer 2

1) 5/21 + 10/21 + 23/21 + 4/21 =
  = (5+10+23+4)/21 = 42/21  =  2
2) 93/120 - 83/150 MCM
   = (930 - 830) / 10
   = 100/10    =  10
3) 8/9 dividido 4/3 
    24/32    =  3/4
4) 90/15 x 41/108 x 34/82
    697/783