Build strong addition skills with this Find the Missing Number – Addition Within 20 resource designed for Grade 1 and Grade 2 learners. Students practice solving for the unknown addend in an equation

This pack is perfect for helping students understand number relationships, strengthen fact fluency, and gain confidence solving equations with missing addends.

The worksheets are clean, simple, and kid-friendly — making them ideal for independent practice, small-group instruction, intervention, or homework. Just print and go!

What’s Included

✔ 30 student worksheets – Addition Within 20
✔ 30 matching answer keys for easy grading

Total: 60 printable pages

Skills Covered

• solve for the missing addend
• practice addition within 20
• build number sense and fluency
• understand equations with unknown values
• apply logical thinking to complete math sentences

Each page provides multiple practice problems to help students gain fluency through repetition without being overwhelming.