Add numbers within 20 using ten frames with the help of this first-grade math worksheet! In this one-page practice worksheet, children will use the given ten frames to add single-digit numbers, filling in the frames as they go to make the number sentences true. This visual method for performing addition is a great way to help young learners build their number sense, hone addition strategies, and recognize patterns. For related practice, check outSubtracting Within 20 Using Ten Framesnext!