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Read a fencing problem carefully

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Perimeter and Area · Solve boundary and missing side problems · 3:46

You'll learn: Distinguish full perimeter from the material actually needed

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Read a fencing problem carefully

3:46

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Read a fencing problem carefully

You'll learn: Distinguish full perimeter from the material actually needed

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Same topic

Solve boundary and missing side problems

1

Find a missing boundary length
3:55
Find a missing boundary length
You'll learn: Use known sides and the perimeter total

Next topic

Understand area and square units

2

Area measures coverage
3:41
Area measures coverage
You'll learn: Cover a region without gaps or overlaps
The unit square changes the count
3:40
The unit square changes the count
You'll learn: Connect unit size to the numerical area measure

Next topic

Explain rectangle and square area methods

2

Rows and columns count the tiles
3:42
Rows and columns count the tiles
You'll learn: Derive rectangle area from a rectangular array
A square is a rectangle with equal sides
3:40
A square is a rectangle with equal sides
You'll learn: Apply the array reasoning to squares

Next topic

Estimate area and combine simple regions

3

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
Remove a region to find what remains
3:43
Remove a region to find what remains
You'll learn: Subtract a known cut-out area

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

1

Whole units are sometimes too coarse
3:26
Whole units are sometimes too coarse
You'll learn: Recognise why a smaller unit is needed