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Mathematics · Grade 1

Shapes, Halves and Fourths

What makes a triangle a triangle? Learners separate defining attributes (three straight sides, closed) from attributes that do not matter (colour, size, direction), build new shapes from flat and solid shapes, and split circles and rectangles into two and four equal shares called halves and fourths, discovering that more equal shares means smaller shares.

  • 3 lessons
  • About 55 minutes
  • Shapes and shares check: 8 questions
  • Ways to answer: choose an answer, match pairs, type a number, shade a shape, sort into groups and true or false
See plans Included with Family, Teacher and School plans. Open in PlayOwl

What learners will discover

  • Tell defining attributes of a shape (number of straight sides, closed) from attributes that do not define it (colour, size, which way it is turned).
  • Put flat or solid shapes together to make a new shape and name the shapes used.
  • Split circles and rectangles into two or four equal shares, name them halves and fourths (quarters), and explain that more equal shares make smaller shares.

Lessons

  1. What makes a shape a shape? 5 steps3 practiceabout 18 min
  2. Put shapes together 5 steps3 practiceabout 17 min
  3. Halves and fourths 7 steps4 practiceabout 20 min
  4. Shapes and shares 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