Shark Learning
Fifth/Subtraction

Find the Missing Tens

Find what multiple of 10 was subtracted from a 2-digit number. Students strengthen place value understanding and practice mental math strategies.
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Study Guide

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Practice Questions

  1. 86 - ? = 46
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    40

  2. ? - 20 = 37
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    57

  3. 93 - ? = 43
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    50

  4. ? - 30 = 38
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    68

  5. 72 - ? = 32
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    40

Teacher Resources
Teaching Notes

This activity strengthens mental math by focusing on how subtracting multiples of ten affects only the tens digit of a 2-digit number. It reinforces place value understanding and subtraction strategies.

Vocabulary
Tens place: The digit representing multiples of ten.
Multiple of 10: A number that can be divided by 10.
Common Mistakes
  • Ignoring the ones digit when it's not zero.
  • Incorrectly subtracting tens (e.g., 7 - 3 = 5).
  • Confusing addition with subtraction.
Differentiation
SupportUse base-10 blocks or a number line for visual support.
ChallengeSolve problems with three-digit numbers or two missing tens.
Discussion Questions
  • How does subtracting multiples of ten affect the ones digit?
  • How does it affect the tens digit?
  • What strategy helps you find the missing number quickly?
  • Explain how to solve 92 - ___ = 42.
Extension Activities
  • Skip count by tens.
  • Use base-ten blocks.
  • Identify tens in numbers.
Parent Tip

Count by tens together to practice number patterns.

Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced
Missing tens subtractionPlace value tensSkip counting