Posted by **Samantha** on Monday, April 6, 2009 at 7:46pm.

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 -
**Damon**, Monday, April 6, 2009 at 7:53pm
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 -
**Samantha**, Monday, April 6, 2009 at 7:55pm
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 -
**Damon**, Monday, April 6, 2009 at 7:55pm
5 + (-3)

from zero right 5

then left three

= 2

-2 - (+8)

from zero left 2

then left 8 more

-10

- Math -
**Damon**, Monday, April 6, 2009 at 7:57pm
You can do it if you stick to the number line. Using parentheses like I did might make it clearer (or not).

- Math -
**Damon**, Monday, April 6, 2009 at 7:58pm
try

-2 + (-5) + 3 - 2

- Math -
**Samantha**, Monday, April 6, 2009 at 7:59pm
k thanks

- Math -
**Damon**, Monday, April 6, 2009 at 8:01pm
-2-5 = -7

-7+3 = -4

-4-2 = -6 answer

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