Place the numbers 1, 2, 3,..., 9 one on each square of a 3 by 3 grid so that all the rows and columns add up to a prime number. How many different solutions can you find?
An ordinary set of dominoes can be laid out as a 7 by 4 magic rectangle in which all the spots in all the columns add to 24, while those in the rows add to 42. Try it! Now try the magic square...
Can you spot the similarities between this game and other games you know? The aim is to choose 3 numbers that total 15.
This is a game for a single player, a pair or a small
You need one calculator.
Agree on your scoring system before you begin. Here is one to
1 point for an odd answer
2 points for an answer ending with 0
3 points for a multiple of 6 (that is; an answer from the 6 times
So far Players 1 and 2 have 5 points each. The game
The player with the highest score at the end of the game wins.
Younger players might find it helpful to track the game with
counters on a Hundred chart.
Is there a strategy to help you build the highest score?
What is the maximum number of turns possible?
What is the smallest number of turns possible in a game?
What is the lowest score possible? What is the highest?
Set a challenge for yourself and/or a partner to find set of
turns that gives a score of exactly 15 (or some other chosen