Arrange the numbers 1 to 16 into a 4 by 4 array. Choose a number.
Cross out the numbers on the same row and column. Repeat this
process. Add up you four numbers. Why do they always add up to 34?
The well known Fibonacci sequence is 1 ,1, 2, 3, 5, 8, 13, 21....
How many Fibonacci sequences can you find containing the number 196
as one of the terms?
No Matter
Age 11 to 14 Short Challenge Level
Think of a whole number, double it, then add 3.
Multiply your answer by 4 and then take away 5.
Now take away the number you first thought of.
Your answer will always be a multiple of which number?