Smallest single digit number

1. -for natural numbers the smallest one-digit is 1 
   -for whole numbers the smallest one-digit is 0 
   -for integers the smallest one-digit is -9
2. If its only the natural numbers that you're thinking of....its 1
   If you include the whole numbers too....its 0
   And including integers....you guessed it....-9
3. http://www.math-only-math.com/numbers-with-digits.html
4. http://www.math-only-math.com/blank-multiplication-table.html#gallery[pageGallery]/1/
5. http://www.math-only-math.com/3rd-grade-math-lessons.html
6. http://www.math-only-math.com/four-digit-numbers.html