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?

Hot Pursuit

Age 11 to 14 Challenge Level

I added together the first 'n' natural numbers (positive integers) and was surprised to notice that my answer was a 3 digit number in which all the digits were the same.