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math

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I am a third grader and have a homework of sketching and labeling all possible rectangles with perimeter of 30 cm and sides whose lengths are whole numbers. I am confuse, i need help please.

  • math - ,

    The formula for perimeter is,
    P = 2w + 2 L
    30 = 2w + 2L
    30 = 2(w + l)
    15 = w + l

    So, for a perimeter of 30, you want to sketch rectangles that the width and length total 15.

    Some possible rectangles,
    14 + 1 = 15
    13 + 2 = 15
    12 + 3 = 15
    11 + 4 = 15
    10 + 5 = 15
    9 + 6 = 15
    8 + 7 = 15

    Do you follow what I am doing?
    I gave you a good start. Find the remaining sides that when added, equal 15.

    Good luck! :)

  • math - ,

    I will try. This will help me to start and gave me an idea. Thank you very much.

  • math - ,

    You're welcome.

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