Number Line Worksheets - Super Teacher Worksheets Kindergarten to 3rd Grade View PDF Number Line: Counting by 3s Count by 3s on these number lines. The number line begins at 0 and ends at 33. 1st through 3rd Grades View PDF Skip Counting By 4s Skip count by 4s and write the correct numbers in the boxes. 1st through 4th Grades View PDF Skip Counting By 5s