Shuffle a set of 0–9 cards and place them face down.
Decide how many cards are to be turned – two will be the easiest.
The player must place the cards in order to make: the largest and smallest possible numbers; the largest and smallest even numbers; and the largest and smallest odd numbers. If played in pairs, the partner helps or checks.
If only two cards are to be used, do not include 0 and either ensure that there is one odd and one even or, better still, do not call for an odd or even category.
If three or more cards are used and all even or all odd cards turn up, swap a card.
Adjust the number of cards to suit age and ability. This activity can also be used for decimal numbers. Make one extra card with a decimal point.