What do the fractions 10/16; 15/24; 20/32; 25/40; and 30/48 have in common?

The Highest Common Factor is 8

Step-by-step explanation:

This is called ' Highest Common Factor'

Considering the denominators which are 16, 24, 32, 40 and 48

16 = 2*2*2*2

24 = 2*2*2*3

32 = 2*2*2*2*2

40 = 2*2*2*5

48 = 2*2*2*2*3

What they have in common most is 2*2*2 = 8