Math!
posted by Person .
Change both measurements to the same unit of measure and find the scale factor.
1) 1ft model of a 1in. fossil
2) 20cm model of a 28m rocket
3) 2ft model of a 30yd sports field
4) 3ft model of a 5yd whale

Math! 
Damon
Well go ahead and try.
what is 12 inches to 1 inch?
In general if you are a physicist and want to change units you write it out so the ones you want to go away cancel
like
1 foot * 12 inches / foot = 12 inches
or
2200 fishes * 1 school / 100 fishes = 22 schools
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