SOLUTION: A rectangular piece of land is 1300 yd x 1500 yd. a) What is the area in square miles? b) What is the area in acres?

There are 3ft in 1yd
There are 5280ft in 1mi 

Start with the product of the dimensions, each placed over 1:



Multiply by unit multiplier  twice to cancel away the
yd's and bring in ft's: 



Multiply by unit multiplier  twice to cancel away the
ft's and bring in mi's:



Cancel the yd's



Cancel the ft's



All that's left is



or



which reduces to



or as a decimal



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There are 640 acres in a square mile.

So we start with



Multiply by unit multiplier  once to cancel away the
mi²'s and bring in acres:



Cancel the mi²'s



All that's left is



or



which reduces to



or as a decimal:



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[Be sure to round off these numbers as your teacher told you.]

Edwin