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Find the measure of a reflex angle

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Lines and Angles · Read a protractor accurately · 3:33

You'll learn: Use a full turn and the smaller measured opening

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Find the measure of a reflex angle

3:33

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Find the measure of a reflex angle

You'll learn: Use a full turn and the smaller measured opening

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Read a protractor accurately

4

Place the protractor correctly
3:25
Place the protractor correctly
You'll learn: Align its centre and zero direction
Choose the scale that starts at zero
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Choose the scale that starts at zero
You'll learn: Read the correct numbered scale
Measure a rotated diagram
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Measure a rotated diagram
You'll learn: Measure independently of page orientation
Spot and repair measurement mistakes
3:31
Spot and repair measurement mistakes
You'll learn: Diagnose misalignment and wrong scale readings

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Draw a requested angle

3

Draw an acute or obtuse angle
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Draw an acute or obtuse angle
You'll learn: Use a baseline, mark and second ray
Draw from a different baseline direction
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Draw from a different baseline direction
You'll learn: Transfer the method to new orientations
Make an angle design and verify it
3:32
Make an angle design and verify it
You'll learn: Apply drawing and measurement in a small task

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Identify supercells and describe neighbours

3

Numbers can describe a position
3:20
Numbers can describe a position
You'll learn: Interpret a count of taller neighbours
A supercell beats its neighbours
3:21
A supercell beats its neighbours
You'll learn: Identify a local maximum rather than the largest number everywhere
Supercells in a grid
3:25
Supercells in a grid
You'll learn: Apply the stated adjacency rule in two dimensions

Next topic

Place and compare numbers on a line

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A number line needs equal steps
3:26
A number line needs equal steps
You'll learn: Connect equal distances to equal numerical increments
Find missing numbers from reference marks
3:35
Find missing numbers from reference marks
You'll learn: Infer the step size and locate values

Next topic

Explore digit sums

3

A number and its digit sum are different
3:33
A number and its digit sum are different
You'll learn: Separate place value from adding digits
Build numbers with a chosen digit sum
3:26
Build numbers with a chosen digit sum
You'll learn: Use constraints to compare possible numbers
Count appearances of a digit
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Count appearances of a digit
You'll learn: Count occurrences rather than just numbers containing the digit