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Mathematics · Grade 1

Tens and Ones

Ten ones bundled together make a ten. Learners build and write two-digit numbers as tens and ones, compare two-digit numbers by looking at the tens first, and find 10 more and 10 less than a number without counting, using base-ten blocks and the hundred chart.

  • 3 lessons
  • About 60 minutes
  • Tens and ones check: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, match pairs, type a number, place on a number line and sort into groups
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What learners will discover

  • Explain that the two digits of a two-digit number stand for tens and ones, and show numbers such as 52 and 80 as tens and ones.
  • Compare two two-digit numbers by comparing the tens first and then the ones, and record the result with >, < or =.
  • Find 10 more and 10 less than a two-digit number without counting, and explain why only the tens digit changes.

Lessons

  1. Bundles of ten 7 steps4 practiceabout 20 min
  2. Compare tens first 5 steps3 practiceabout 20 min
  3. 10 more and 10 less 6 steps3 practiceabout 20 min
  4. Tens and ones 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.
  • Number TrainAll aboard! Load exactly the right number of animals onto the train.

More 1st grade math

Guide for grown-ups