These worksheets are designed to give students practice composing and decomposing teen numbers to develop a better understanding of place value and the relationship between addition and subtraction. This set focuses on understanding teen numbers as a bundle of ten ones, called a “ten” and one, two, three, four, five, six, seven, eight, or nine “ones”. Use these worksheets for a variety of activities, including math centers, morning work, small groups, assessments, educational interventions, and