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Subtraction Build It within 20 is a hands-on activity where students can use cubes (or any other applicable tool) to practice subtraction facts within 20.
This activity can be differentiated in many ways based on the needs of your students. You could laminate the cards, put them on a ring, and have the students write the answers with dry erase markers. To make the activity more difficult, give students one of the recording sheets and have them write the corresponding number sentence with the card. I have included empty circles on each card so you can create your own set of cards based on your needs. Just write a letter on 26 cards, print off the recording sheet, and you're ready to go! There are also 2 different recording sheets to provide different levels of support.