Learn to spot acute and obtuse angles and put angles in order of size, by turning, sorting, tracing and spinning angles with Hinge the robot.
Year 4 maths · 1
Year 4 maths · 1
Year 4 maths · 1
Year 4 maths · 1
What the chapters cover in the national curriculum in England:
Acute and Obtuse Angles is an interactive maths game that teaches children aged 7 to 10 to identify acute and obtuse angles and to compare and order angles up to two right angles, matching the Year 4 national curriculum in England.
Guided by Hinge the robot, players drag the arm of an angle maker to make right, acute and obtuse angles, test corners with a folded-paper right angle checker, and sort angle cards into boxes. They hunt for angles on clocks, scissors, roofs and inside shapes, then lay a tracing of one angle on top of another to see which turns more.
The game tackles the two classic mix-ups head on: longer arms do not make a bigger angle, and turning an angle does not change its size. An optional warm-up recaps right angles and turns, and a ten-question final challenge checks everything.
An acute angle is any angle smaller than a right angle, which is a square corner. The word acute means sharp, so think of the pointy tip of a pizza slice or a pair of scissors opened just a little.
An obtuse angle is bigger than a right angle but smaller than a straight line. The word obtuse means blunt, and you can see one when a laptop screen is tipped back past upright or clock hands show 5 o'clock.
No, the length of the arms does not change the size of an angle. An angle's size is the amount of turn between its arms, so two angles with the same turn are the same size however long their arms are drawn.
The game suits children aged 7 to 10 and follows the Year 4 maths curriculum in England for angles. An optional warm-up on right angles and turns helps younger players or anyone who needs a quick refresher first.
The game has a warm-up, four chapters and a ten-question final challenge, and takes about 40 minutes to play from start to finish. Children can open any chapter from the map and play it in a short session.
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