This PDF is a set of 10 pages for your younger students to use to practice counting to 100. Each has a complete number chart from 1 to 100.
The first is a full number chart with every number in a plain white cell. The remaining are for practicing skip counting and the numbers that are skipped are grayed out. For example, on the Skip 4 sheet numbers 1 through 3 are gray, 4 is white, 5 through 7 are gray, 8 is white, and so on up to 100.