Choose any three by three square of dates on a calendar page.
Circle any number on the top row, put a line through the other
numbers that are in the same row and column as your circled number.
Repeat this for a number of your choice from the second row. You
should now have just one number left on the bottom row, circle it.
Find the total for the three numbers circled. Compare this total
with the number in the centre of the square. What do you find? Can
you explain why this happens?
Can you go through this maze so that the numbers you pass add to exactly 100?
What is the units digit for the number 123^(456) ?
Daniel (Age 10, Anglo-Chinese School, Singapore) pointed out a fact about the way the numbers are placed on dice. This is particularly important to remember if you don't have any real ones to work with.
I have put everyone's solutions together into a table so that it will be easy to check whether you have found a new one or not.
Kieran (Age 10) & Carl (Age 9, Moorgate C.P. School) - 1 solution
Christina (Age 11, Marlborough Primary School) - 1 solution
Caroline & Sarah (Year 7, The Mount School, York) - 4 solutions
Leah (Age 10) & Sophie Simpson (Age 11, Moorgate C.P. School) - 11 solutions
Edward (Age 10, Tattingstone School) - 14 solutions - Well done!!