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Mathematics · Grade 3

Addition and Subtraction within One Thousand

Learners become fluent with addition and subtraction within 1,000: they connect base-ten models to the written column method (regrouping in each place), subtract across zeros, choose smart strategies such as adjusting 398 to 400 or counting up, check with the inverse operation, and use rounding to judge whether an answer is reasonable.

  • 4 lessons
  • About 80 minutes
  • Within 1,000 check: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, match pairs, type a number, put in order and true or false
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What learners will discover

  • Add within 1,000 using place-value strategies and the written column method, regrouping ones and tens when needed.
  • Subtract within 1,000 using place value, including regrouping across zeros.
  • Choose a strategy that fits the numbers (adjusting to a friendly number, counting up) and check with the inverse operation.
  • Estimate by rounding to judge whether a sum or difference is reasonable.

Lessons

  1. Add with the column method 5 steps3 practiceabout 20 min
  2. Subtract with place value 5 steps3 practiceabout 20 min
  3. Smart strategies 5 steps3 practiceabout 20 min
  4. Is it reasonable? 5 steps2 practiceabout 20 min
  5. Within 1,000 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.
  • Place-Value WorkshopBuild numbers with rods and cubes — and trade ten ones for a ten.

More 3rd grade math

Guide for grown-ups