100 Happy Days Subtraction Within 20 Color by Number Worksheet

Subtraction Within 20100th Day of School1st Grade2nd Grade

Support subtraction fact fluency within 20 with this cheerful 100 Happy Days mystery picture. Students solve each subtraction problem, color by code, and reveal the hidden image one section at a time. This color-by-number page is simple to pull out for 100th day fun with your 1st and 2nd graders.

Designed for independent work and easy review, this no-prep printable keeps students engaged with flexible options for centers, rotations, or quiet work time.

🏫 For classroom teachers: Great for 1st & 2nd grade classroom math centers, morning work, and sub plans.

🏠 For homeschool parents: Ideal for fun independent daily practice, hands-on learning, and self-checking.

Perfect for:

  • 100th Day of School math activities and celebrations
  • 100 Happy Days math centers and classroom rotations
  • Independent practice or quiet work time
  • Morning work, early finishers, or homework
  • Coloring displays or student work boards
  • Subtraction Within 20 review and reinforcement
  • Sub plans or small-group practice
  • Subtraction fact fluency practice
  • Printable take-home activities and more!

Want a different picture or skill? Customize this worksheet in the generator.