Addition Subtraction Within 20 Ten Frames Worksheets Math CentersHelp students build confidence with addition and subtraction within 20 using engaging ten frames worksheets and math center activities. This resource gives students visual, hands-on practice with addition facts, subtraction facts, counting on, counting back, and using ten frames as a strategy. Designed for Kindergarten, 1st Grade, and early 2nd Grade, these activities are perfect for building number sense, math fluency, and conf