The engineer weighed two pieces of metal for an experiment. the piece of iron weighed 5 1⁄4 pounds and the piece of aluminum weighed 1 7⁄8 pounds. how much more did the piece of iron weigh than the piece of aluminum?

Convert the mixed numbers into fractions.











Because both fractions have different denominators, we have to change one fraction so that its denominator will match. We will take 21/4 and multiply both the numerator and denominator by 2 so that it will match the denominator of 15/8:



Now we can subtract 42/8 by 15/8:



Convert the fraction back into a mixed number:



The piece of iron weighted 3 and three-eighths pounds more than the piece of aluminum.

Cbottom left is the correct one.

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