Skills Covered

How to Use This Worksheet

Fill in missing numbers so each row and column adds up to the target. Two difficulty levels: sums within 10 and sums within 20.

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