Odd One Out

How to play

1. Read the property: for example "multiples of 4".
2. Test each of the four numbers.
3. Tap the one that fails.

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: Even and odd
• Level 2: Multiples
• Level 3: Primes, squares and multiples

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

What this game practises

Sorting numbers by their properties is how number sense grows beyond sums. Knowing at once that 51 is not prime, that 64 is a square or that 84 is a multiple of 7 pays back in fractions, factors and algebra. The game states the property each time, so there is always one clear answer.

Tips for parents and teachers

• For multiples, remind the child of the quick tests: digits adding to a multiple of 3, last two digits for 4.
• For primes, test 2, 3, 5 and 7. That is enough up to 100.
• After each answer ask why the other three belong.

Play it without a screen

Write four numbers on paper where three share something. The fun is that a clever player may find a different reason for a different odd one out. Accept any reason that is true.

More games for classes 5 and 6

• 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
• Guess the AngleAn angle is drawn. Judge its size by eye and choose the closest number of degrees.Classes 4 to 7

All games Games for classes 5 and 6