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Math lesson plan 路 3rd grade (Year 4 in England) 路 45 minutes

Find area by counting unit squares

Geometry

CCSS 3.MD.C.5CCSS 3.MD.C.6England: Y4 Measurement

Objective and success criteria

Students will: Find area by counting unit squares.

  • I can answer questions on today's skill on my own, without help.
  • I can explain each step and say why it works.
  • I can check my answer and spot a mistake.

Before and after

Needs first: Arrays and multiplication

Leads to: Volume by counting layers of unit cubes

Materials: Rulers and protractors, Squared or dotted paper, Shape cut-outs, Mini whiteboards and pens, Printed student sheet (below).

Warm-up 路 5 min

  • Quick retrieval from earlier learning (Arrays and multiplication). Students answer on mini whiteboards.
  • Show answers together and note who needs support in the main task.

Hook 路 5 min

  • Show a photo of a building, a tile pattern or a road sign and ask what shapes and angles students can spot.
  • Share the objective: Find area by counting unit squares. Read the success criteria together.

I do: model it 路 10 min

  • Work through the example out loud, saying why you do each step, not just what you do.
  • Model one question from the student sheet, thinking aloud.
  • Pause after each step and ask a student to say what comes next.

We do: guided practice 路 10 min

  • Do these together. Students try each step on whiteboards before you reveal it.
  • Use the hints as prompts rather than giving the answer.

You do: independent practice 路 10 min

  • Students work on the student sheet. Circulate and check the first two answers of every student early.
  • Students who finish: write a question of their own for a partner, with the answer.

The 8 questions are on the student sheet below, with answers in the key.

Exit ticket 路 5 min

  • Two questions on their own. Sort answers into got it / nearly / not yet to plan the next lesson.

Watch out for

  • Thinking a square turned on its corner is no longer a square.
  • Reading the wrong scale on a protractor.

Support and stretch

Support

  • Review first: Arrays and multiplication.
  • Use concrete materials: rulers and protractors.
  • Give the first step of each question, or a partly worked example to finish.
  • Pair with a confident partner for the guided practice.

Stretch

  • Move on to: Volume by counting layers of unit cubes.
  • Explain a common mistake in writing and how to fix it.
  • Write a word problem that uses today's skill, then solve a partner's.

Homework and more practice

Free online practice with hints and printable worksheets for this skill: eurekami.com/math/grade-3.

Free lesson plan from eurekami.com/lesson-plan-builder

eurekami

Find area by counting unit squares

Name

Date

Score/ 8

  1. Question 1

    Daniel finds the area by counting every square one by one. Mei multiplies 4 脳 8. Will they get the same answer? Give the area in square units.

    Answer

  2. Question 2

    Each small square is 1 square unit. What is the area of the rectangle?

    Answer

  3. Question 3

    A tiled floor is 8 tiles long and 6 tiles wide. Each tile is 1 cm by 1 cm. What is the area in square centimetres?

    Answer

  4. Question 4

    Priya finds the area by counting every square one by one. Fatima multiplies 5 脳 4. Will they get the same answer? Give the area in square units.

    Answer

  5. Question 5

    A tiled floor is 4 tiles long and 2 tiles wide. Each tile is 1 cm by 1 cm. What is the area in square centimetres?

    Answer

  6. Question 6

    Arjun finds the area by counting every square one by one. Kofi multiplies 5 脳 4. Will they get the same answer? Give the area in square units.

    Answer

  7. Question 7

    A tiled floor is 7 tiles long and 5 tiles wide. Each tile is 1 m by 1 m. What is the area in square metres?

    Answer

  8. Question 8

    Chloe finds the area by counting every square one by one. Amara multiplies 6 脳 4. Will they get the same answer? Give the area in square units.

    Answer

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Answer key: Find area by counting unit squares

  1. 1. 32

  2. 2. 30

  3. 3. 48

  4. 4. 20

  5. 5. 8

  6. 6. 20

  7. 7. 35

  8. 8. 24