Factors and Multiples
I found this game on the latest update on the terrific website, Enriching Maths.
This is a game for two players.
The first player chooses a positive even number that is less than 50, and crosses it out on the grid.
The second player chooses a number to cross out. The number must be a factor or multiple of the first number.
Players continue to take it in turns to cross out numbers, at each stage choosing a number that is a factor or multiple of the number just crossed out by the other player.
The first person who is unable to cross out a number loses.
As a challenge – What is the longest sequence of numbers you were able to cross out? Post your solutions.
A full screen version of the game can be found here.
This is a very challenging game and you should try to keep the small numbers.What I found is that if you use the numbers 1 and 5 and then you 95, you will win.The longest sequence Tyrell and I came up with was forty.
This is the sequence, 50,100,25,5,15,45,90,10,80,40,8,64,32,4,16,48,6,36,72,9,18,54,2,68,34,1,11,88,44,22,66,3,12,84,7,28,14,42,21 and 63.
at 5:10 there were 2318 on 7-5-13
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Oh because i was confused before the second comment.:)