Question

Phone number is 17 through 21 I'm really confused because I just don't get it

Answer 1

#17: 1 7/9 times 1 1/4=2 2/9
#18: 3 5/9 x 1 5/8= 5 7/9
#19:2 5/8 x 1 3/10= 3 33/80
#20: 2 5/6 x 3/4= 2 1/8
#21: 2 7/9 x 1 1/8 = 3 1/8

Hope I helped