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.
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zero
You increase the number by one i.e the zero will become a 1.
zero, it's always zero long before earth was created...i guess
You can make a zero with your fingers by not showing any. You can also call it "none." That was what it was called before zero resisted.
zero + zero = zero