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Mathematics · Grade 5

Decimal Addition and Subtraction

Learners model decimal sums and differences on hundredths grids and number lines, then add and subtract decimals to hundredths by lining up place values and regrouping across the decimal point. Estimation and inverse operations are used to check every answer, and the course closes with money and measurement problems.

  • 4 lessons
  • About 75 minutes
  • Decimal sums and differences check: 10 questions
  • Ways to answer: choose an answer, match pairs, type a number, place on a number line, put in order and shade a shape
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What learners will discover

  • Model sums and differences of decimals to hundredths with hundredths grids and number lines.
  • Add and subtract decimals to hundredths by lining up place values and regrouping, including across the decimal point.
  • Use estimation and the inverse operation to decide whether a decimal sum or difference is reasonable.
  • Solve one- and multi-step money and measurement problems that use decimal addition and subtraction.

Lessons

  1. See decimal sums and differences 8 steps4 practiceabout 18 min
  2. Line up the places 9 steps5 practiceabout 22 min
  3. Is it reasonable? 6 steps3 practiceabout 15 min
  4. Money and measurement 6 steps3 practiceabout 20 min
  5. Decimal sums and differences check 10 questions at the end

Keep exploring

Games to practice with

  • Number-Line HopHelp the frog hop to the right number — from counting to negative fractions.
  • Array OrchardPlant trees in rows, pack fruit into crates and split big fields to multiply.
  • Fraction BridgesSaw planks into equal parts, paint fractions, build bridges that match and lay planks end to end to add.

More 5th grade math

Guide for grown-ups