Shark Learning
Grade 3/Fractions

Add Decimals to the Tenths (640)

Master adding decimals with one decimal place (tenths). Students learn to align decimal points vertically, add column by column, and regroup tenths to ones when necessary. This foundational skill connects to money (dollars and dimes), measurement, and real-world calculations where precision matters.
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Teacher Resources
Teaching Notes

Students must understand place value to add decimals correctly. Key concept: align decimal points vertically. Use money (dollars and dimes) as a concrete model. Common error: treating decimals as whole numbers. Practice: Start with models (base-10 blocks), then pictorial, then abstract.

Vocabulary
Decimal: A number with a decimal point.
Tenths: The first place value after the decimal.
Common Mistakes
  • Forgetting to align decimal points
  • Not regrouping when tenths exceed 10
  • Treating decimals as whole numbers without considering place value
  • Misaligned decimal points
  • Forgetting to regroup
  • Ignoring place value
  • Incorrect decimal placement
Differentiation
SupportProvide additional scaffolding, use manipulatives, break down into smaller steps, allow more time.
ChallengeChallenge with extension activities, create own problems, explore deeper connections, work with larger numbers or more complex scenarios.
Discussion Questions
  • Why must we line up decimal points?
  • What happens when tenths add up to 10 or more?
  • How is adding decimals similar to adding whole numbers?
  • Why is aligning decimal points important?
  • How is adding decimals like adding money?
  • When do you need to regroup tenths?
  • Can you estimate the sum before adding?
Extension Activities
  • Add three decimal numbers
  • Create word problems with decimal addition
  • Estimate sums before calculating and check accuracy
Parent Tip

Ask your child to add prices like $1.50 + $2.30.

Learning Path
Skill Cluster

Number Sense & Operations

Estimated Time

15 minutes

Skills Practiced
add decimals one placedecimal regroupingalign decimal points
Prerequisites
  • 637
  • 638
  • Add Whole Numbers with Regrouping
  • Understand Tenths
  • Decimal Place Value
Next Steps
  • Add Decimals to Hundredths
  • Subtract Decimals to Tenths
  • Add Decimals - Two Decimal Places
  • Subtract Decimals - One Decimal Place
  • Decimal Place Value