Number Catcher

How to play

1. Read the rule at the top.
2. Tap each number that fits it.
3. A wrong tap counts as a slip. Find them all to finish the round.

A round has no clock. The result screen shows how many you finished and how many slips you made, and keeps your best for each level on this device.

Levels

• Level 1: Even numbers and easy multiples
• Level 2: Multiples and factors
• Level 3: Primes, factors and squares

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

What this game practises

This is a sieve in miniature. Scanning a set of numbers and picking out the multiples, factors or primes is the skill behind finding common factors, simplifying fractions and factorising. Because every number on the board must be judged, the child practises twelve small decisions in a round, and learns as much from the numbers left alone as from those tapped.

Tips for parents and teachers

• For factors, work in pairs: if 3 is a factor of 36, so is 12.
• Slow and right beats fast and wrong. The slips are counted.
• Ask which number on the board was hardest to decide, and why.

Play it without a screen

Write the numbers 1 to 30 on paper. Call a rule and let the child circle every number that fits. Use a different colour for each rule and see which numbers collect the most circles.

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
• 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