Ocean Number Line Subtraction Worksheet to 20

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