3-Digit Integer Addition Worksheet | Grade 5 Essential

This Grade 5 integer addition worksheet provides students with targeted practice in solving vertical addition problems involving three-digit negative and positive integers. By working through these 25 structured problems, learners develop a concrete understanding of how different signs interact during the addition process, leading to greater computational fluency and algebraic readiness.

At a Glance

• Grade: 5 · Subject: Math
• Standard: CCSS.MATH.CONTENT.7.NS.A.1 — Apply and extend previous understandings of addition and subtraction to add and subtract integers
• Skill Focus: Vertical addition of positive and negative 3-digit integers
• Format: 5 pages · 25 problems · Answer key included · PDF
• Best For: Independent practice and skill reinforcement
• Time: 20–30 minutes

What's Inside

This comprehensive PDF packet contains 5 distinct pages of vertical addition exercises, with each page featuring 5 clear, easy-to-read problems. The worksheet specifically focuses on the interaction between a negative three-digit integer and a positive three-digit integer. A full answer key is included at the end of the document to facilitate quick grading and immediate student feedback.

Skill Progression

• Guided Practice: The first page introduces the vertical format, allowing students to visualize the alignment of hundreds, tens, and ones places while managing signs.
• Supported Practice: Subsequent pages provide repetitive exposure to varying integer magnitudes (e.g., -593 + 427), helping students internalize the rules of integer addition.
• Independent Practice: The final pages challenge students to apply their mental strategies consistently across 25 total problems without additional scaffolding.

This approach follows the gradual-release model, moving from initial exposure to computational mastery.

Standards Alignment

The primary alignment for this resource is `CCSS.MATH.CONTENT.7.NS.A.1`, which requires students to "Apply and extend previous understandings of addition and subtraction to add and subtract integers; represent addition and subtraction on a horizontal or vertical number line diagram." While this standard is traditionally introduced in Grade 7, this resource serves as an essential bridge for Grade 5 and 6 students ready for advanced operations. Both standard codes can be copied directly into lesson plans, IEP goals, or district curriculum mapping tools.

How to Use It

This worksheet is ideal for use after a direct instruction lesson on integer rules. Assign it as independent seatwork to gauge student understanding or use it as a formative-assessment tool by observing which students struggle with the vertical alignment or sign-switching logic. Most students will complete the 25 problems in approximately 20 to 30 minutes, making it a perfect fit for a standard math block or as a targeted homework assignment.

Who It's For

This resource is designed for Grade 5 students who have mastered basic 3-digit addition and are beginning their journey into negative numbers. It is also suitable for middle school students requiring remedial practice or intervention. For best results, pair this worksheet with a physical or digital number line to help students visualize the movement toward zero when adding a positive integer to a negative one.

Aligned to `CCSS.MATH.CONTENT.7.NS.A.1`, this resource solidifies the foundational skill of adding integers with different signs using a 3-digit vertical format. Mastery of these operations is a critical prerequisite for pre-algebra and higher-level mathematics. With 25 clearly formatted problems and a complete answer key, this worksheet provides the high-repetition practice necessary to develop procedural fluency and solidify understanding of the number system. It's an effective tool for classroom assessment or supplementary home study, guiding students toward mastery of complex operations.