Many 'fractions' can be easily created using ratios of multiples of 30: Multiples:
30 60 90 120 150 . . . Ratios:
30/1, 60/2, 90/3, 120/4, 150/5 . . .
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30 minutes is 1/4 of 2 hours
The fraction 24 over 30 is written in lowest form as four-fifths.
It is the change in y divided by the change in x.
27.2
7/20