I made this pack of subtraction worksheets for students to practice their basic subtraction facts, as well as mental math. The first page is single digit basic facts to 10, the second page is double minus single digit to 20, the third is double digits minus single digit to 20, and the 4th sheet is 2-digit facts to 40. These should be able to be solved mentally. This 3-pack of leveled subtraction worksheets can be used for practice during warm-up/morning work (this is how I intend to use them--at different points throughout the year--or they could be used for differentiating math groups), a math center, homework, etc. Fun and St. Patrick's Day - themed! Great for a baisc facts review for any grade! I also have a Fall, Halloween, Winter, Holiday /Christmas, Valentine's Day, Spring and Summer Subtraction Pack!--as well as Addition, Subtraction, Multiplication and Division Packs for the various seasons. Enjoy!