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Mathematics · Grade 4

Multi-Digit Addition and Subtraction

Learners add and subtract multi-digit whole numbers with the standard algorithm, regrouping across several places and across zeros. They use rounding to estimate whether an answer is reasonable, check results with the inverse operation, and analyse common mistakes in worked calculations.

  • 4 lessons
  • About 80 minutes
  • Add and subtract check: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, type a number, put in order, sort into groups and write a short answer
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What learners will discover

  • Add multi-digit whole numbers with the standard algorithm, regrouping when a place has 10 or more.
  • Subtract multi-digit whole numbers with the standard algorithm, including regrouping across zeros.
  • Estimate sums and differences by rounding and use the estimate to judge whether an answer is reasonable.
  • Check an answer with the inverse operation and explain errors in a worked calculation.

Lessons

  1. Adding with regrouping 6 steps4 practiceabout 20 min
  2. Subtracting with regrouping 6 steps4 practiceabout 22 min
  3. Is my answer reasonable? 5 steps3 practiceabout 18 min
  4. Check it and fix it 6 steps3 practiceabout 20 min
  5. Add and subtract check 8 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.
  • Paint by AnswersSolve each space, dip your brush and watch a picture come to life.
  • Array OrchardPlant trees in rows, pack fruit into crates and split big fields to multiply.

More 4th grade math

Guide for grown-ups