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March 26, 2017

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Could someone please explain to me how you get answers when you add a negative number to a negative number or a positive number to a positive number or a negative and positive number added together, because my teacher tried explaining it to me, but I'm completly lost. The ones I don't understand the most are like, for example, 5 + -3 or -2 - +8 and I wouldn't know how to answer that.
If you could help that would be nice, THANKS!!!

  • Math - ,

    draw a number line with zero in the middle.

    now look at negative(left) + negative(more left) --> more negative
    -1 + (-1) = -1-1 = -2

    now look at positive + positive
    1+1= 2 but you know that

    now look at negative + positive
    left then right
    -1 + 1 = 0

    similarly positive + negative
    right then left
    +1 + (-1) = 1-1 = 0

  • Math - ,

    see we done that and i get it but im still a bit confused try giving me a problem and i will figure it out.

  • Math - ,

    5 + (-3)
    from zero right 5
    then left three
    = 2

    -2 - (+8)
    from zero left 2
    then left 8 more
    -10

  • Math - ,

    You can do it if you stick to the number line. Using parentheses like I did might make it clearer (or not).

  • Math - ,

    try
    -2 + (-5) + 3 - 2

  • Math - ,

    k thanks

  • Math - ,

    -2-5 = -7
    -7+3 = -4
    -4-2 = -6 answer

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