About this worksheet
A friendly ocean themed number line worksheet. Kids use the 1 to 19 number line at the top to hop back and solve each subtraction problem, writing the answer in the box. Counting back on a number line makes the meaning of subtraction visible before facts become automatic.
Thirty-three problems with differences within 20. Print it as a warm-up, a center activity, or homework for early first graders.
What students will practice
- Subtract within 20 using a number line
- Count back to find the difference
- Build subtraction fluency to 20
Details
- Grade level
- Grade 1
- Subject
- Math · Subtraction
- Pages
- 1
- Format
- PDF · US Letter and A4 included
- License
- Free for classroom use · Attribution appreciated
- Last updated
- June 24, 2026
