3rd Grade 3-Digit Addition Worksheet | MathPro365

ABOUT THE WORKSHEET

This comprehensive 3rd-grade math worksheet is designed to help students master the essential skill of three-digit addition. Featuring 40 unique vertical addition problems, this resource provides the high-repetition practice necessary for students to develop automaticity and accuracy. The problems range in difficulty, incorporating scenarios that require regrouping (carrying) across tens and hundreds places, as well as simpler problems to build confidence.

Developing proficiency in three-digit addition is a cornerstone of the 3rd-grade curriculum. It reinforces place value understanding and prepares students for more complex multi-step word problems and subtraction with borrowing. This layout is clean and distraction-free, making it suitable for timed drills, homework assignments, or structured classroom math centers.

QUICK DETAILS

• Grade: Grade 3
• Topic: 3-Digit Addition (Vertical)
• Question Count: 40 Problems
• Format: High-quality printable PDF
• Skills Focus: Regrouping, Place Value, Mathematical Fluency

STEP-BY-STEP SOLVED EXAMPLES

Review these examples with your students to model the correct procedure for solving three-digit addition problems vertically.

Example 1: No Regrouping

Problem: 552 + 145

• Add the ones: 2 + 5 = 7.
• Add the tens: 5 + 4 = 9.
• Add the hundreds: 5 + 1 = 6.
• Final Answer: 697

Example 2: Regrouping Tens and Ones

Problem: 479 + 163

• Add the ones: 9 + 3 = 12. Write '2' in the ones place and carry '1' to the tens.
• Add the tens: 7 + 6 + 1 (carried) = 14. Write '4' in the tens place and carry '1' to the hundreds.
• Add the hundreds: 4 + 1 + 1 (carried) = 6.
• Final Answer: 642

Example 3: Regrouping Hundreds

Problem: 595 + 114

• Add the ones: 5 + 4 = 9.
• Add the tens: 9 + 1 = 10. Write '0' in the tens place and carry '1' to the hundreds.
• Add the hundreds: 5 + 1 + 1 (carried) = 7.
• Final Answer: 709

TEACHER & PARENT TIPS

To maximize the effectiveness of this worksheet, consider using base-ten blocks alongside the problems to provide a visual and tactile representation of regrouping. If a student struggles, have them draw columns for Hundreds, Tens, and Ones to keep their numbers aligned. For advanced learners, challenge them to estimate the sum to the nearest hundred before solving to build number sense. This worksheet can also be used for a "Math Relay" game where students solve one row at a time and check their answers with a partner to encourage collaborative learning.