You need to start by comparing the same units of measurement.
60 minutes = 1 hour
3x60=180
3 hours = 180 minutes, so the initial fraction is 20 over 180 (20/180), but this fraction can be simplified.
Both 20 and 180 can be divided by 10 (or 20 if you wish to be quicker, but I'll do 10 simply because it's easier to work with)
20/10=2
180/10=18
Both 2 and 18 can still be simplified (by 2)
2/2=1
18/2=9
Your final fraction would be 1 over 9 (1/9).
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To find the fraction of 20 minutes in 3 hours, first convert both time periods to the same unit. Since there are 60 minutes in an hour, 3 hours is equal to 3 x 60 = 180 minutes. Now, the fraction would be 20 minutes out of 180 minutes, which simplifies to 1/9. So, 20 minutes is 1/9 of 3 hours.
20/3 is an IMPROPER fraction. As a mixed numbert it is 6 2/3
20/3
fraction of 15cm/20 cm = 15/20 or 3/4
Answer: 15/100 --> 3/20 0.15 is written as 15/100 or 3/20 as a fraction.
.015 as a fraction is 15/1000. In simplified form it is 3/200.