Maths · Naming an angle by its size
Angle Namer
The size of the marked angle is written on it. Which word names that angle?
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Why this works
The angle opens 177°, which is past the quarter turn of 90° but has not reached the straight line of 180°, so it is obtuse.
Helping a child through Angle Namer
Hints, least revealing first
- Hold the corner against a quarter turn. Does it open less far than a square corner, or further?
- A straight line is 180°, which is two square corners side by side. Anything smaller than one square corner is acute.
- Put the printed size next to 90 and next to 180, and see which side of each it falls on.
When they finish it: “Named it.”
11+ skill this exercise practises
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Angle Namer practises one skill. Maths has 55 of them
A free diagnostic covers every maths skill and the other three subjects, and comes back with a shortlist rather than a list.