Here is a chance to play a version of the classic Countdown Game.
Choose any 6 cards. The top row contains the numbers 25, 50, 75,
100 and the bottom row contains numbers from 1 to 10.
Click on "play" to set a target. The challenge is to use the
numbers available and the four standard operations (addition,
subtraction, multiplication and division) to hit the target.
Each card can only be used once. It may not be necessary to use
all the cards.
It is always possible to hit the target. Clicking on "Show a
solution" will offer one possible way in which the target can be
reached, but it will not necessarily be the most efficient
solution.
You may like to take on the challenge on your own or choose to
play it as a game in which the first to reach the target gets a
point. First to 10 points wins.
An alternative game could set a time limit and require the
players to get as close to the target as possible. Each player
could start with 100 points and then points could be deducted
according to how far from the target each player has reached -
e.g. 6 away from the target would mean that 6 points were
deducted. After a set number of rounds, the player with the
highest score wins.
A more challenging version of this game is available at Countdown
Fractions.
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