This engaging math resource helps students learn how to use compensation to add two-digit numbers efficiently. Students will practice adjusting numbers to make friendly tens, then solve addition problems using number lines and missing-number activities. These worksheets are perfect for building strong mental math skills and improving number sense.

What's Included:

• 15 Student Worksheets
• 15 Answer Keys
• Printable PDF format
• No prep – just print and go!

Worksheet Breakdown:

Pages 1–8: Complete the Number Line and Find the Sum

• Students fill in the missing numbers on the number line.
• Use the compensation strategy to solve two-digit addition problems.

Pages 9–15: Fill in the Missing Number, Then Solve

• Students determine the missing compensation number.
• Solve the addition problem using mental math strategies.

Skills Covered:

• Two-digit addition within 100
• Compensation strategy
• Number line addition
• Mental math
• Number sense
• Making friendly tens

Perfect For:

• 2nd Grade Math Centers
• Independent Practice
• Homework
• Morning Work
• Small Group Instruction
• Intervention
• Test Prep

Why Teachers Love This Resource:

• Easy to use and no prep
• Builds conceptual understanding
• Reinforces efficient addition strategies
• Includes complete answer keys
• Kid-friendly and engaging format

File Type:

• PDF

Total Pages:

• 15 Worksheets + 15 Answer Pages (30 pages total)

This resource is an excellent way to help students gain confidence with two-digit addition while practicing an important mental math strategy in a fun and structured format!