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Math Help - Square inches

  1. #1
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    Square inches

    My dad came up with 41 im asking is he right.
    Cause u no dads sometimes there rong xD

    A legal-sized paper measures 8.5 inches by 14 inches. A one-inch border of paper is cut off from each of the four sides. How many square inches have been cut off?

    And sorry boout all the questions guys but were doing a contest in my class and we get prizes for the winners :P
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  2. #2
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    Talking

    Quote Originally Posted by xsriel View Post
    My dad came up with 41 im asking is he right.
    Cause u no dads sometimes there rong xD

    A legal-sized paper measures 8.5 inches by 14 inches. A one-inch border of paper is cut off from each of the four sides. How many square inches have been cut off?

    And sorry boout all the questions guys but were doing a contest in my class and we get prizes for the winners :P
    Hey xsriel, Looks like your dad is correct again. taking one inch off every side of the paper actually equals taking off 2 inches because it actually cutting out of one side TWICE (check out my sketch in the attachment). So, initially it was 14 long by 8.5 wide. 2 inches off each side would leave, 12 inch long by 6.5 inch wide. then u calculate 14 times 8.5 = 119 then subtract 6.5 times 12 = 78 (which is what is left after the cutting) will give you 41 inches^2 (119 - 78 = 41)

    Hopefully i've been helpful

    tsal15
    Attached Thumbnails Attached Thumbnails Square inches-square-inches.jpg  
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  3. #3
    Senior Member euclid2's Avatar
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    Quote Originally Posted by xsriel View Post
    My dad came up with 41 im asking is he right.
    Cause u no dads sometimes there rong xD

    A legal-sized paper measures 8.5 inches by 14 inches. A one-inch border of paper is cut off from each of the four sides. How many square inches have been cut off?

    And sorry boout all the questions guys but were doing a contest in my class and we get prizes for the winners :P
    The area of the legal-sized piece of paper is 8.5 14 = 119 square inches. When a one-inch border is cut fro all four sides, we are left
    with a paper that measures 6.5 inches by 12 inches and has an area of 6.5 12 = 78 square inches. The difference 119 78 = 41 is the number of
    square inches that have been cut of

    hope this helped
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  4. #4
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    Quote Originally Posted by tsal15 View Post
    Hey xsriel, Looks like your dad is correct again. taking one inch off every side of the paper actually equals taking off 2 inches because it actually cutting out of one side TWICE (check out my sketch in the attachment). So, initially it was 14 long by 8.5 wide. 2 inches off each side would leave, 12 inch long by 6.5 inch wide. then u calculate 14 times 8.5 = 119 then subtract 6.5 times 12 = 78 (which is what is left after the cutting) will give you 41 inches^2 (119 - 78 = 41)

    Hopefully i've been helpful

    tsal15
    yeah thanks
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