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Remove a region to find what remains

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Perimeter and Area · Estimate area and combine simple regions · 3:43

You'll learn: Subtract a known cut-out area

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Remove a region to find what remains

3:43

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Remove a region to find what remains

You'll learn: Subtract a known cut-out area

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Same topic

Estimate area and combine simple regions

2

Estimate coverage on a grid
3:44
Estimate coverage on a grid
You'll learn: Use full and partial squares to estimate area
Split a shape into known regions
3:56
Split a shape into known regions
You'll learn: Add non-overlapping rectangular areas

Next topic

Compare perimeter and area independently

3

Same area can have different perimeters
3:57
Same area can have different perimeters
You'll learn: Track coverage and exposed edges separately
Same perimeter can have different areas
3:52
Same perimeter can have different areas
You'll learn: Compare rectangular shapes with a fixed boundary length
Design under a boundary or coverage constraint
3:48
Design under a boundary or coverage constraint
You'll learn: Explain a choice using both measurements

Next topic

Explore triangle area by cutting a rectangle

3

A diagonal shares a rectangle into equal areas
3:42
A diagonal shares a rectangle into equal areas
You'll learn: Explain half-area by cutting and matching
Different triangles can share the same area
3:46
Different triangles can share the same area
You'll learn: Extend the rectangle comparison using two pieces
Use triangle pieces in an area puzzle
3:48
Use triangle pieces in an area puzzle
You'll learn: Calculate a composite region with the taught method

Next topic

Recognise the need for fractional units

2

Whole units are sometimes too coarse
3:26
Whole units are sometimes too coarse
You'll learn: Recognise why a smaller unit is needed
Share one whole fairly
3:29
Share one whole fairly
You'll learn: Build a unit fraction by equal sharing

Next topic

Explain why equal parts matter

2

Equal parts make a valid fractional unit
3:37
Equal parts make a valid fractional unit
You'll learn: Distinguish equal shares from arbitrary pieces
Different shapes can have equal area
3:35
Different shapes can have equal area
You'll learn: Recognise equal-area parts without requiring identical shapes

Next topic

Interpret numerator and denominator

2

The denominator names the unit
3:26
The denominator names the unit
You'll learn: Identify the size of one equal part
The numerator counts those units
3:33
The numerator counts those units
You'll learn: Connect repeated unit fractions to fraction notation

Next topic

Locate fractions on a number line

1

Fractions are numbers with positions
3:43
Fractions are numbers with positions
You'll learn: Locate fractional lengths between whole numbers