Two or three children sit around the grid of cards and you call out: "I Spy with my maths eye...42".
The idea is that children look for cards that are next to each other which multiply together to make that product. The first to spot the target number keeps the two cards from the grid. Play continues untill all the cards have been taken. The player with the most cards is the winner.
Another game is Prime Time. Use the number cards 1 to 9 from each suit and shuffle. Each player is dealt five cards with the rest placed on the table. Take turns to pick up the top card from the pack. The aim is to make a prime number less than 100 with your cards. These are placed on the table. Continue to play untill all the cards have been used. The winner is the player with most prime numbers.
John Dabell is a numeracy consultant and teacher trainer