Help your students build strong number sense with this engaging set of addition and subtraction worksheets within 20. These activities use number lines, visual models, and word problems to support conceptual understanding and hands-on practice. Perfect for first grade math, this resource makes learning operations within 20 clear, interactive, and meaningful.

What’s Included:

• Addition with number lines (0–10 and 0–20)
  
• Subtraction with number lines (0–10 and 0–20)
  
• Mixed addition & subtraction practice
  
• Reversed number line activities
  
• Adding and subtracting with objects (visual models)
  
• Word problems using number lines
  
• Printable, no-prep worksheets
  

Skills Reviewed:

• Addition within 20
  
• Subtraction within 20
  
• Using a number line to solve problems
  
• Counting forward and backward
  
• Understanding jumps on a number line
  
• Solving real-world word problems
  
• Building number sense and fluency
  

How It Can Be Used:

• Whole group math lessons
  
• Small group instruction
  
• Math centers
  
• Independent practice
  
• Homework
  
• Math intervention support
  
• Early finisher activities
  
• Sub plans
  

Why Teachers Will Love It:
This resource is truly no-prep—just print and teach. The structured number line support helps students visualize operations instead of memorizing steps. With a mix of skill practice and word problems, it keeps learning balanced and meaningful. The variety of activities makes differentiation easy while reinforcing core first grade math standards.