Question

2/3×4/5
3/4:6/8
5/9-2/7
2/5+3/8

Answer 1

2/3•4/5=8/15
3/4:6/8=2/2=1
5/9-2/7=17/63
2/5+3/8=31/40

Answer 2

1) ⅔×4/5=8/15; 2) 3/4:6/8=3/4:8/6=2/2=1; 3) 5/9-2/7= 35/63-18/63=17/63; 4) 2/5+3/8=16/40+15/40=31/40