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Check out our complete guide to the number 0 to understand how it works in math. Is zero a number? (read zero factorial) is defined to equal 1. Adding (or subtracting) 0 to any number leaves that number unchanged; In most (if not all) numerical systems, 0 was identified before the idea of … 6 − 6 = 0 (the difference between six and six is zero) it is also used as a … Zero zero shows that there is no amount. There are several proofs that have been offered to … 0 (zero) is a number representing an empty quantity. Involved answer (s): 0 is the integer that precedes the positive 1, and follows −1.