Pack of 50 bright and colorful missing addend cards to print. Addition and subtraction problems are facts up to 20. Use over and over to reinforce basic facts and to increase critical thinking with missing addends. Helps support fact families. Use in a center as task cards asking students to write problems to go along with the card; Use in small group giving students the word problem and they must choose the correct task card that represents the word problem; Use in partner work or cooperative work groups....so many uses for so many levels.