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Fourth/Addition

Column Addition: Three 3-Digit Numbers

Add sets of three 3-digit numbers (vertical addition).
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Prerequisites
3-Digit Column Addition with Regrouping6 WS
456
+ 347
 

Practice Questions

  1. 456 + 678 + 789 = ?
    Show answer

    1,923

  2. 234 + 345 + 421 = ?
    Show answer

    1,000

  3. 125 + 380 + 496 = ?
    Show answer

    1,001

  4. 210 + 315 + 275 = ?
    Show answer

    800

  5. 502 + 407 + 318 = ?
    Show answer

    1,227

Teacher Resources
Lesson Plan

Adding 3-Digit Numbers

Standards
3.NBT.A.2
Printable Aids
Place Value ChartGrid Paper
Teaching Notes

Focus on careful place value alignment and systematic regrouping (carrying over tens and hundreds). Encourage students to add one column at a time, always starting from the ones place.

Vocabulary
Sum: The result of adding numbers.
Carry over: Moving a digit to the next column when adding.
Common Mistakes
  • Forgetting to regroup (carry over) digits to the next column.
  • Incorrectly adding digits within a column.
  • Misaligning numbers by their place value.
  • Trying to add multiple columns simultaneously instead of sequentially.
Differentiation
SupportProvide grid paper to assist with digit alignment. Use base ten blocks to physically model the regrouping process. Start with adding two 3-digit numbers before advancing to three.
ChallengeChallenge students to add four 3-digit numbers or introduce three 4-digit numbers. Encourage them to create and solve their own word problems requiring this specific addition skill.
Discussion Questions
  • Why is it essential to start adding from the ones column?
  • What steps do you take when the sum of a column is 10 or greater?
  • How is adding three 3-digit numbers similar to and different from adding two 3-digit numbers?
  • Can you describe a real-world situation where you might need to add three numbers like these?
Extension Activities
  • Add four 2-digit numbers.
  • Use base-ten blocks.
  • Create your own problems.
Parent Tip

Have your child add the prices of three grocery items.

Learning Path
Skill Cluster

Multi-Digit Addition & Place Value

Grade Level

2-3

Skills Practiced
Addition of three numbersRegroupingPlace value