This is a set of cards for a number line challenge. Included are cards to 120 in 1's, 2's, 3's, 4's, 5's, and 10's.
I print the cards on different colors of cardstock and lay the starting card on the floor. My students work in teams to put the rest of the numbers in order to 120. I usually have the counting by 1's set as a stand-alone center. We follow-up with the skip-counting sets the next day.
I have found this to be a big help to my firsties for skip-counting and working together as a team.