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Third/Addition

Decimal Addition in Columns

Column addition with decimals (2–3 addends, up to thousandths).
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Study Guide

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Practice Questions

  1. 3.4 + 2.75 = ?
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    6.15

  2. 12.5 + 3.75 = ?
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    16.25

  3. 1.25 + 0.75 + 2.5 = ?
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    4.5

  4. 6.05 + 3.95 = ?
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    10

  5. 4.8 + 5.2 = ?
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    10

Teacher Resources
Teaching Notes

Model aligning decimal points and carrying across tenths/hundredths.

Common Mistakes
  • Not aligning decimals
  • Dropping a carry
  • Misaligning decimal points
  • Incorrect regrouping
  • Forgetting decimal point in sum
  • Place value errors
Differentiation
SupportUse grid paper; add fewer addends.
ChallengeMore addends; include decimals with varying lengths.
Discussion Questions
  • Why is decimal alignment crucial?
  • How is decimal addition similar to whole number addition?
  • What happens if you don't line up decimals?
  • When do we use decimal addition in real life?
Learning Path
Skill Cluster

Number Operations

Estimated Time

14 minutes

Skills Practiced
Decimal alignmentAdd decimals