Missing number worksheets | K5 Learning Missing numbers Missing number worksheets 1-10, 1-20 These kindergarten worksheets provide additional counting practice by asking students to fill in the missing numbers. All counting is forward by ones. We provide multiple worksheets with count ranges from 1-10 and 1-20. Count 1-10: Worksheet #1 Worksheet #2 Worksheet #3 Worksheet #4 5 More