show how 30/56 is smaller than 5/7 and 6/8

Answer 1

You need to find the common denominator.

5/7 = 40/56
6/8 = 42/56

http://www.mathsisfun.com/numbers/common-denominator.html

Answer 2

5/7=(8*5)/(8*7)=40/56

6/8=(7*6)/(7*8)=42/56

30/56 < 40/56

30/56 < 42/56