Guess the Angle

How to play

1. Compare the angle with a right angle, the corner of a page, which is 90°.
2. Decide whether it is less, about the same, or more.
3. Tap the closest size.

Choose Relaxed for ten questions with no clock, or Race to answer as many as you can in sixty seconds. After a wrong answer the game shows the right one and the reason. At the end it lists the questions you missed and keeps your best score for each level on this device.

Levels

• Level 1: Big differences
• Level 2: Closer choices
• Level 3: Fine judgement

Start at the level where about eight answers in ten are right, and move up when it feels easy.

What this game practises

Children learn to measure angles with a protractor, and the classic mistake is to read the wrong scale and write 130° for an angle that is plainly less than a right angle. The cure is estimation. A child who can see that an angle is "a bit less than half a right angle" will catch a wrong reading at once. This game builds that eye, using 90° and 45° as landmarks.

Tips for parents and teachers

• Keep a sheet of paper nearby. Its corner is a ready-made right angle.
• Fold the corner in half to get 45°.
• Name the type each time: acute, right or obtuse.

Play it without a screen

Open a pair of scissors or a book to some angle and ask for an estimate, then check with a protractor. Clock hands work too: at 3 o'clock they make 90°.

More games for classes 5 and 6

• Odd One OutThree numbers share a property and one does not. Find the one that does not belong.Classes 2 to 7
• Number CatcherA board of twelve numbers. Tap every number that fits the rule, and leave the rest.Classes 3 to 7
• Fraction PiesA circle is cut into equal slices and some are shaded. Name the fraction.Classes 3 to 6

All games Games for classes 5 and 6