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Home : 2008 : Feb : 4

    I found some :)
    By saraebeth
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    Anyone have anything else? This makes sense to me, different than how I learned but I think the kids will understand this way better than the way the TE says to teach them.

    ADDITION:

    If the signs are the same then you add the two numbers and keep the
    sign.

    Ex. 6 + 2 = 8 or -6 + -2 = -8

    If the signs are different, subtract the two numbers and take the sign
    of the larger number.

    Ex. -6 + 2 = -4 or 6 + -2 = 4

    SUBTRACTION:

    Change the sign of the second number, then add the two numbers using the
    rules for addition, above.

    Ex. 6 - 2 = 6 + (-2) = 4
    Ex. -6 - -2 = -6 + (+2) = -4
    Ex. -6 - 2 = -6 + (-2) = -8
    Ex. 6 - -2 = 6 + (+2) = 8



    -Doctors Sonya and Jennifer, The Math Forum
    Check out our web site!
    http://mathforum.org/dr.math/

    View the original thread this idea was posted on


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