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Fourth/Addition

2-Digit (Sum < 100)

Mental addition with totals strictly less than 100.
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Study Guide

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2-Digit (Sum < 100) preview

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Practice Questions

  1. 23 + 29 = ?
    Show answer

    52

  2. 18 + 27 = ?
    Show answer

    45

  3. 46 + 23 = ?
    Show answer

    69

  4. 35 + 24 = ?
    Show answer

    59

  5. 17 + 32 = ?
    Show answer

    49

Teacher Resources
Teaching Notes

Invite multiple solution paths and quick mental checks.

Common Mistakes
  • Not aligning place values mentally.
  • Forgetting to add tens after ones.
  • Miscalculating regrouped values.
  • Exceeding sum 100 limit.
Differentiation
SupportUse base ten blocks or a number line.
ChallengeAdd three 2-digit numbers mentally.
Discussion Questions
  • Which mental strategy worked best for you?
  • How did you add the tens and ones separately?
  • Can you explain your mental calculation process?
  • Why is checking your answer important?
Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

10 minutes

Skills Practiced
Addition mental under 100