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Math Help - subtract fractions

  1. #1
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    subtract fractions

    Can the following story problems about a bird feeder be solved by subtracting 3/4-1/2? If so, explain why. If not, explain why not and solve the problems if they can be solved. Write a different story problem about a bird feeder that can be solved by subtracting 3/4-1/2.

    Story problem 1 about a bird feeder: A bird feeder was filled with 3/4 of a full bag of bird seed. The birds ate 1/2 of what was in the bird feeder. What fraction of a full bag of bird seed did the birds eat?

    Story problem 2 about a bird feeder: A bird feeder was filled was 3/4 of a full bag or bird seed. The birds ate 1/2 of what was in the bird feeder. What fraction of a full bag of bird seed is left in the bird feeder?

    Thank you
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  2. #2
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    Quote Originally Posted by recca View Post
    Story problem 1 about a bird feeder: A bird feeder was filled with 3/4 of a full bag of bird seed. The birds ate 1/2 of what was in the bird feeder. What fraction of a full bag of bird seed did the birds eat?
    So...they ate 1/2 of the 3/4 of the bag? You would have to multiply 3/4 and 1/2.... so... \frac{3}{4}\cdot\frac{1}{2}=\frac{3}{8} of the bag.

    Story problem 2 about a bird feeder: A bird feeder was filled was 3/4 of a full bag or bird seed. The birds ate 1/2 of what was in the bird feeder. What fraction of a full bag of bird seed is left in the bird feeder?
    Now you just subtract that amount from one.
    \frac{8}{8}-\frac{3}{8}=\frac{5}{8} left.

    I hope that's right! Sorry if it's not....
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