# NRICH

Source Institutions
In this math game, learners throw dice and place the numbers in one of four boxes. Learners repeat this three more times and the learner with the largest four digit numbers is the winner.

1 cent - \$1 per group Ages 8 - 14 5 to 10 minutes
Source Institutions
In this version of a Sumo wrestling bout, players use mathematical skills to move their opponent's counter beyond the track and "out of the ring." Learners reveal playing cards and the player with the

1 cent - \$1 per group Ages 6 - 11 5 to 10 minutes
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In this number puzzle/trick, learner #1 thinks of a number between 1 and 63. Learner #2 shows learner #1 six cards and asks them whether the cards contain their number.

1 cent - \$1 per group Ages 14 - 18 5 to 10 minutes
Source Institutions
This puzzle provides an interesting context which challenges learners to apply their knowledge of the properties of numbers.

1 cent - \$1 per student Ages 11 - 14 5 to 10 minutes
Source Institutions
In this game, learners build up six stacks of cards in the middle of the table, face up, in order from 1 at the bottom to 20 on the top. The first player to get rid of all his cards is the winner.

1 cent - \$1 per group Ages 6 - 11 5 to 10 minutes