Help students build math fluency with these Teen Number Addition and Subtraction Task Boxes (Facts 10β20)! This hands-on resource is perfect for math centers, independent practice, intervention, and special education instruction. Students will solve teen number addition (10β20) and subtraction facts (13β20) and match the correct answer card using Velcro. Once laminated, these task boxes are durable, reusable, and ideal for daily math fact practice. Whatβs Included: Addition task boxes (10β20)Su