Measure area using counting with squares as a strategy | Maths

Starter quiz

Put the missing words from the sentence into the correct order: ___ is the measurement of a ___ surface. It measures a ___ space.
- 1
  
  ⇔
  
  area
- 2
  
  ⇔
  
  flat
- 3
  
  ⇔
  
  2D
Which of these shapes is most commonly used for measuring the area of a 2D space, because it tessellates so well and has right angles?
- circle
- square ✓
- triangle
- hexagon
Which of the following shapes are rectilinear?
- a
- b ✓
- c
- d ✓
What is the most efficient way of finding the area of this rectangle?
- Count all of the individual squares.
- Count the squares in one column and then count in steps of that number. ✓
- Count the squares in one row and then count in steps of that number.
I am counting in threes: 3, 6, 9... Tick all of the numbers that would appear in the sequence when counting in threes.
- 11
- 30 ✓
- 13
- 21 ✓
- 18 ✓
Which of these would make one whole?
- One half + one half ✓
- One quarter + one quarter
- One quarter + three quarters ✓
- One half + one quarter
- One third + two thirds ✓

This shape has an area of ______ square units.
- '10' ✓
This shape has an area of ______ square units.
- '16' ✓
Which strategies could be used to find the area of this shape? Select all that apply.
- Count the squares individually. ✓
- Add the square made of four squares to the rectangle made of 24 squares.
- Split it into rectangles. 8 + 8 + 2 + 2 ✓
- Split it into rectangles. 6 + 6 + 4 + 4 ✓
- Subtract the square made of four squares from the rectangle made of 24 squares. ✓
This shape has an area of ______ square units.
- '13' ✓
This shape has an area of ______ square units.
- '18' ✓
This shape has an area of ______ square units.
- '18' ✓

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Pupils might count a part square - such as a triangle - as one square unit.

The slides show two parts moving together to make a whole square. Cutting out and physically moving the parts is an effective strategy.