This center activity will help your students build fluency with counting to 1,000. It could also be used as a guided math activity.
Students find the missing numbers from 1 to 1,000. Each group of numbers (1-100, 101-200, etc) has 12 different cards. You get a total of 120 cards!
For differentiation, you could print each group of numbers on a different color paper as students work up to 1,000.