-9
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To create an addition problem using numbers 0-9 only once, you could use 4 + 5 = 9. This equation uses each number from 0 to 9 exactly once.
3-3=0
We usr them in place of real numbers in order to figure the problem out. The significance of using them is so you can figure out the problem because there could be many numbers that can solve that equation.
This was a bit of a pain but here it is: 123-45-67+89=100
The commutative property of addition says that it does not matter in which order you add the numbers, you will get the same result. For example, 5 + 3 = 8 and 3 + 5 = 8.
Solve the problem using the + sign for the variable. Then solve the problem using the - sign for the variable. Report your answer as the answer that you got using + or the answer that you got using -.