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Mathematics · Grade 2

Subtract with Place-Value Models

When there are not enough ones to take away, trade a ten for ten ones. Learners subtract within 100 and then within 1,000 with base-ten models, including tricky numbers with zeros such as 403 − 158, use counting up as a second strategy, and check every subtraction with addition.

  • 3 lessons
  • About 70 minutes
  • Subtraction check: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, type a number, sort into groups and true or false
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What learners will discover

  • Subtract within 100, trading a ten for ten ones when needed (52 − 27 = 25).
  • Subtract within 1,000 with models, trading a hundred or a ten when needed, including across zeros (403 − 158).
  • Subtract by counting up, check subtraction with addition, and explain why 'take the smaller digit from the bigger' gives wrong answers.

Lessons

  1. Trade a ten 6 steps3 practiceabout 23 min
  2. Three-digit subtraction 4 steps2 practiceabout 24 min
  3. Count up and check 6 steps3 practiceabout 23 min
  4. Subtraction 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 2nd grade math

Guide for grown-ups