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Whole numbers go from 0 upwards. But we need numbers below 0 too! Temperature below 0ยฐC, depth below sea level, money owed. Negative numbers: -1, -2, -3... Integers = whole numbers + negative numbers = {...-3,-2,-1,0,1,2,3...}. Positive integers: 1,2,3... Negative integers: -1,-2,-3...