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Third/Subtraction

3-Digit Column Subtraction: Find the Missing Number

Practice subtracting 3-digit numbers in columns with missing minuend or subtrahend.
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WorksheetsTeacher InfoLearning Path

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3-Digit Column Subtraction: Find the Missing Number preview

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Prerequisites
3-Digit Subtraction without Regrouping10 WS
865
- 432
?

Practice Questions

  1. 543 − 0 = ?
    Show answer

    210

  2. 0 − 432 = ?
    Show answer

    111

  3. 654 − 0 = ?
    Show answer

    321

  4. 0 − 210 = ?
    Show answer

    444

  5. 765 − 0 = ?
    Show answer

    555

Teacher Resources
Lesson Plan

Vertical Subtraction Methods

Standards
2.NBT.B.7
Printable Aids
Number LinePart-Part-Whole Mat
Teaching Notes

This collection helps students apply their understanding of inverse operations to find missing numbers in 3-digit subtraction problems. Emphasize place value and regrouping techniques. This is often considered an advanced or Grade 3 topic in many curricula, particularly in Canada where 3-digit operations are typically introduced in Grade 3.

Vocabulary
Minuend: The number from which another is subtracted.
Subtrahend: The number to be subtracted.
Difference: The result of subtraction.
Common Mistakes
  • Adding instead of subtracting (or vice versa) to find the missing part.
  • Guessing instead of using inverse operations.
  • Not checking if the equation is true.
  • Incorrectly applying inverse operation (e.g., subtracting when addition is needed).
  • Errors in regrouping or borrowing across multiple places.
  • Misaligning numbers in columns, leading to place value errors.
Differentiation
SupportProvide a partially solved example or use manipulatives (like base ten blocks) to model the inverse operation. Start with problems that don't require regrouping.
ChallengeIntroduce problems with multiple missing numbers or challenge students to create their own missing number problems. Explore multi-step word problems involving this skill.
Discussion Questions
  • How can addition help us solve a subtraction problem with a missing number?
  • When do we need to 'borrow' or 'regroup' in subtraction?
  • How is finding a missing minuend different from finding a missing subtrahend?
Extension Activities
  • Create missing number addition problems.
  • Use manipulatives to show missing parts.
  • Write number stories with missing numbers.
Parent Tip

Ask your child to create a similar problem with a missing number for you to solve.

Learning Path
Skill Cluster

Number & Operations in Base Ten

Grade Level

2-4

Skills Practiced
Missing number subtractionInverse operationsFact families