Shark Learning
First/Subtraction

Missing Subtrahend from One Thousand

Find what 3-digit number was subtracted from a whole thousand. Students practice working backwards and strengthen understanding of regrouping.
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Study Guide

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Practice Questions

  1. 2,000 - ? = 1,542
    Show answer

    458

  2. ? - 627 = 2,373
    Show answer

    3,000

  3. 4,000 - ? = 3,165
    Show answer

    835

  4. ? - 294 = 4,706
    Show answer

    5,000

  5. 3,000 - ? = 2,424
    Show answer

    576

Teacher Resources
Teaching Notes

Emphasize using the inverse relationship between addition and subtraction to find the missing number. Encourage students to check their answers by adding back.

Vocabulary
Subtrahend: The number being subtracted.
Difference: The result of subtraction.
Common Mistakes
  • Errors in regrouping across zeros
  • Misunderstanding inverse operations (adding instead of subtracting or vice versa)
  • Place value errors when aligning numbers
Differentiation
SupportUse base-ten blocks or number lines to visualize regrouping.
ChallengeSolve similar problems with larger whole numbers or multiple missing parts.
Discussion Questions
  • How can addition help you solve a subtraction problem?
  • Why is regrouping important when subtracting from a number like 1000?
  • What strategies can you use to find a missing number in a subtraction equation?
  • How do you know if your answer is correct?
Extension Activities
  • Find missing numbers to 500.
  • Use a number line to 1000.
  • Write your own problems.
Parent Tip

Ask your child to count up from a number to 1000.

Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced
Missing subtrahendSubtraction within 1000Inverse operations