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Mathematics · Grade 2

Fluent Strategies within Twenty

Learners become accurate and flexible with addition and subtraction facts within 20: they use make ten, doubles, near doubles and think-addition, choose the strategy that fits each fact, and explain it. They also find out whether a group up to 20 is odd or even by pairing, and write even numbers as doubles. Fluency means accurate and flexible, never timed.

  • 3 lessons
  • About 60 minutes
  • Facts and odd or even check: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, match pairs, type a number and sort into groups
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What learners will discover

  • Add and subtract within 20 accurately, recalling sums of two one-digit numbers and using strategies for the rest.
  • Choose an efficient strategy for a fact (make ten, doubles, near doubles, think addition, count on or back) and explain it.
  • Decide whether a group of up to 20 is odd or even by pairing or counting by 2s, and write an even number as a sum of two equal addends.

Lessons

  1. Facts and strategies 5 steps3 practiceabout 20 min
  2. Choose a strategy 6 steps3 practiceabout 20 min
  3. Odd and even 5 steps3 practiceabout 20 min
  4. Facts and odd or even 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