Skills Covered

How to Use This Worksheet

Find missing numbers in equations where values range from 10 to 20. Targeted teen number practice.

Tips for Success

• Encourage students to check their work with the inverse operation
• Allow use of manipulatives or drawings for support
• Time practice sessions to build fluency gradually
• Celebrate improvement in speed and accuracy over time

Common Core Standards Alignment

This worksheet supports the following Common Core State Standards for Mathematics:

• 1.OA.C.6 - Add and subtract within 20, demonstrating fluency within 10
• 2.OA.B.2 - Fluently add and subtract within 20 using mental strategies