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PlayOwl

Mathematics · Grade 3

Area, Arrays and Perimeter

Area is the number of unit squares that cover a shape; perimeter is the distance around it. Learners tile rectangles and connect tiling to multiplying side lengths, split rectangles and L-shapes into parts, find perimeters (including a missing side), and discover that shapes with the same perimeter can have different areas.

  • 4 lessons
  • About 85 minutes
  • Area and perimeter check: 8 questions
  • Ways to answer: fill in the blanks, choose an answer, count, match pairs, type a number and shade a shape
See plans Included with Family, Teacher and School plans. Open in PlayOwl

What learners will discover

  • Find the area of a rectangle by counting unit squares and by multiplying its side lengths, giving the answer in square units.
  • Use the distributive property with area and find the area of rectilinear figures by splitting them into rectangles.
  • Find the perimeter of a polygon, including when one side length is unknown.
  • Tell area from perimeter in real situations and show that rectangles with the same perimeter can have different areas.

Lessons

  1. Area with unit squares 6 steps3 practiceabout 22 min
  2. Split the area 5 steps3 practiceabout 22 min
  3. Perimeter 5 steps3 practiceabout 20 min
  4. Area or perimeter? 5 steps2 practiceabout 21 min
  5. Area and perimeter 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