Math Activity Worksheets - Kidzone Grade One Christmas Worksheets: . Two numbers from 0 to 10 Vertical (subtraction)Horizontal (subtraction)Fill in the blanks - two numbers from 0 to 10 Vertical (subtraction)Horizontal (subtraction)Add a column of three numbers (the first number is always "1") ; One number from 10 to 19 and one number from 0 to 9 (addition) (subtraction)