One player secretly writes two large numbers (25, 50, 75, or 100) and four small numbers (from 1 to 10) on a piece of paper. The other player secretly writes a three-digit target.

After revealing the numbers and target, both players then have to try and get as near to the target as possible by combining some or all of the six numbers using addition, subtraction, multiplication, and division. Only integers may be used at any stage in the calculation, and you can only use each number once.

The player who gets closest to the target scores 10 points for getting the target exactly, 7 points for getting within 5 of the target, or 5 points for getting within 10 of the target. If both players are equally close they both score. No points are scored for an answer further than 10 from the target.

For example, if one player chose the six numbers:

and the other player chose the target:

it could be solved perfectly as follows: