A whole number less than 10 is any non-negative counting number from 0 up to 9.

What are the whole numbers less than 10?

These are:

  • 0
  • 1
  • 2
  • 3
  • 4
  • 5
  • 6
  • 7
  • 8
  • 9

In math terms, “whole numbers” usually means 0, 1, 2, 3, … with no fractions, decimals, or negatives, so “less than 10” just trims that list down to 0 through 9.