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math

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using rounding or compatible numbers,which numbers would you choose to estimate the exact product of 25 times 25.

  • math - ,

    I don't see how one would get an exact answer by rounding.

    Try using this:

    (a -c)(b +c) = ab + (a-b)c - c^2
    with a = 30, b = 20 and c = 5

    25 * 25 = 600 + 50 - 25 = 625

  • math - ,

    I would round by doing 20 * 30, since 25 is exactly halfway between. 2 * 3 = 6, put 2 0's on the end..600

  • math - ,

    "Estimating the exact product" seems like an oxymoron to me.

  • math - ,

    955

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