-1
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It means that the number is negative. Negative numbers are always under 0.
It is: 0 1 2 3 ... etc
The number before zero is negative one (-1). In the number line, negative numbers come before zero, with each number getting smaller as you move to the left. Therefore, the number that comes immediately before zero is negative one.
0 + 0 Equals 0
NoAnswer:Adding 0 to number as in 2+0 does not change the number.Adding 0 toa number as in 2, 20, 200 ..... changes the number by 10 for each additional 0