Grade 5/Addition
Decimal Addition in Columns (783)
Column addition with decimals (2–3 addends, up to thousandths).
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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
Prerequisites
- 762
- 773
- Whole Number Column Addition
- Place Value to Thousandths
- Understanding Decimal Notation
Next Steps
- Decimal Subtraction in Columns
- Decimal Multiplication
- Adding Decimals with Varying Place Values
- Adding Decimals Mentally
- Rounding Decimals