For integers: negative one; For rational numbers: any infinately small fraction that has the word "thousandths" in it; For irrational numbers would include the "radical" of any rational number, so it could be at a mathematical limit to zero. This all assumes the numbers are in English. (p.s. the word 'and' is not part of any whole number, it is commonly abused grammar. The exceptinos are a mixed number or a whole number and decimal, i.e. three and one half OR seven and three hundredths)

Jul 24 2006, 7:59 PM