Shark Learning
Fifth/Addition

Add Whole Tens

Fluency adding whole tens to 2-digit numbers.
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Study Guide

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Practice Questions

  1. 34 + 50 = ?
    Show answer

    84

  2. 27 + 40 = ?
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    67

  3. 65 + 30 = ?
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    95

  4. 48 + 20 = ?
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    68

  5. 53 + 40 = ?
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    93

Teacher Resources
Teaching Notes

Emphasize adding tens affects only the tens place.

Common Mistakes
  • Adding to the ones digit
  • Incorrectly identifying tens place
  • Forgetting to update the tens value
Differentiation
SupportUse base-10 blocks or a number line to visualize.
ChallengeAdd whole hundreds; create two-step mental problems.
Discussion Questions
  • How does adding 10, 20, or 30 change a number?
  • What part of the number stays the same?
  • When is it useful to add whole tens mentally?
  • Can this strategy be used with other numbers?
Learning Path
Skill Cluster

Number Sense & Mental Math

Estimated Time

8 minutes

Skills Practiced
Add whole tens