# Math

Rafi had a board that was 15 1/2 feet long. He cut three pieces off the board that are each 3 7/8 feet long. How much of the board is left?

I am confused on how to figure out the answer for the above.

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1. Multiply 3 7/8 feet by 3.

Subtract the product from 15 1/2.

You may want to change the fractions to decimals.

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Ms. Sue
2. How do I multiply 3 7/8 x 3?
I never multiplied with a whole number and a fraction?

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3. One way to do it is to multiply 3 * 3 = 9
3 * (7/8) = 21/8 = 2 5/8

9 + 2 5/8 = 11 5/8

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Ms. Sue
4. So if the answer is 2 5/8 then would I have to take 15 1/2 and find the common denominator?

Would it then be

15 4/8-11 5/8?
But then I can't subtract 4-5

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5. Or would the answer just be 11 5/8?

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6. 15 4/8 = 14 12/8

14 12/8 - 11 5/8 = 3 7/8 feet of board is left

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Ms. Sue
7. Nothing

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8. 35 feet

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9. XD The Answer 15.5 because this - 11.625 + 3.875 Which Mean It goes to 3 7/8

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10. show anser

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