Express each ratio in it lowest term

Question

25cm:3m
100cm:5m
60cm:2m
3600s:2hours
10:90:5

Answer 1

look for common factors to eliminate. For example,
10:90:5 all have 5 as a factor, so
10:90:5 = 2:18:1

Answer 2

0.25 meters / 3 meters
or
25 centimeters/ 300 centimeters
which is
1/12
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100 cm/500 cm = 1/5
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60/200 = 6/20 = 3/10
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3600 seconds is an hour
1/2
======================
5 is lowest common denominator
2/18/1