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A number line can help you visualize this. See http://en.wikipedia.org/wiki/Number_line for an example, and a description.
On a number line, adding 3 means to go 3 units to the right; if you start at -9 and go 3 units to the right, you end at -6, 'tis as simple as that. (Subtracing a number means going a certain number of units to the left.)
What else can I help you with?
What is 3 plus 3 plus 3 plus 6 plus 9 equal?
3 + 3 + 3 + 6 + 9 = 24
What does -3 plus -6 equal to?
-9
What is -9 plus 6 equal?
-3
What does 2 plus 3 plus 6 plus 9 equal?
TWENTY 20 2+3=5+6=11+9=20
Why 6 minus 2 equal 4 and 8 plus 7 equal 3 and 9 plus 5 equal what?
6-2 = 4 8+7 ≠3 9+5 = 14
What does 1 plus 6 plus 9 minus 8 plus 4 minus 5 plus 2 plus 3 equal?
1 + 6 + 9 - 8 + 4 - 5 + 2 + 3 = -6
What is 6 plus 3 squared?
3
What is the value of expression negative 12 minus 3 plus 9?
Negative 12 minus 3 plus 9 is equal to -6
What does 3 plus 6 equal?
-9
If 3 plus 6 equals 9 what does 6 plus 3 equal?
Addition in decimals is commutative; that is, it doesn't matter what order you add the numbers, they will give the same result. So 3 + 6 = 6 + 3 = 9.
What is 3 plus 6-?
The answer is 9. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.
What is 9 plus 9 plus 9 plus 9 plus 9 plus 9 plus plus 6 plus 6 plus 6 plus 6 plus 2 plus 2 plus 23 plus 3 plus 3 plus 4 plus 4 plus 4?
9 + 9 + 9 + 9 + 9 + 9 + 6 + 6 + 6 + 6 + 2 + 2 + 23 + 3 + 3 + 4 + 4 + 4 = 123
