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Mathematics · Grade 3

Place Value and Rounding

Learners revisit place value to 1,000 and then learn to round numbers to the nearest ten and the nearest hundred by deciding which multiple a number is closer to on a number line. They use the halfway rule, avoid the 'round twice' trap, and use rounding to make sensible estimates in real situations.

  • 4 lessons
  • About 70 minutes
  • Rounding check: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, type a number, place on a number line, put in order and sort into groups
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What learners will discover

  • Read, write and order numbers to 1,000 and give the value of each digit.
  • Round two- and three-digit numbers to the nearest 10 using a number line and place value.
  • Round three-digit numbers to the nearest 100, including numbers exactly halfway.
  • Use rounding to estimate in a real situation and explain the reasoning.

Lessons

  1. Place value to 1,000 5 steps3 practiceabout 15 min
  2. Round to the nearest ten 5 steps3 practiceabout 18 min
  3. Round to the nearest hundred 5 steps3 practiceabout 18 min
  4. Rounding in real life 5 steps2 practiceabout 19 min
  5. Rounding 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