Subtraction for second grade. Students determine the missing number using Common Core Math Strategies; given the minuend and difference, students use various strategies to determine the subtrahend, example 15 - ? = 6 15 - 9 = 6. There are 26 cards with 8 to a page and the numbers used go up to 20. A number line, recording sheet, answer key, and Exit Tickets are included. Extend and Enrich Learning Subtraction, this activity is perfect for students who finish early. ยท Extend the activity let the