Write the following fractions in order from smallest to largest. 3/10,9/20,17/25,3/5

={3/10, 9/20, 3/5, 17/25}

Write each number using the same denominator; one common denominator = 100.

3/10    =  30/100

9/20    =  45/100

17/25  =  68/100

3/5     =  60/100

Now, compare numerators:  30/10  <  45/100  <  60/100  <  68/100

So, 3/10  <  9/20  <  3/5  <  17/25