Weekly Problem 16 - 2012
If the odd numbers on two dice are made negative, which of the totals cannot be achieved?
Weekly Problem 26 - 2011
Alberta won't reveal her age. Can you work it out from these clues?
Weekly Problem 25 - 2009
Jack does a 20-question quiz. How many questions didn't he attempt?
Weekly Problem 17 - 2008
If p is a positive integer and q is a negative integer, which of these expressions is the greatest?
Weekly Problem 53 - 2011
Find a number between 100 and 999 that has its middle digit equal to the sum of the other two digits. Can you find all possibilities?
Weekly Problem 32 - 2009
I have a max/min thermometer in my greenhouse. What were the maximum and minimum temperatures recorded when I looked at it on Wednesday evening?
Weekly Problem 10 - 2006
Tick's watch is slow and Tock's watch is fast. How long is it before their watches differ by an hour?
Weekly Problem 31 - 2011
Can you find a number and its double using the digits $1$ to $9$ only once each?
Weekly Problem 47 - 2008
Can you solve this magic square?
Weekly problem 47 - 2006
Cibara numerals are the same shape as Arabic numerals, but are used in the opposite order. Working in Cibara numerals, what is the answer to 837 + 742?
Weekly Problem 32 - 2017
Itchy has a million fleas. His anti-flea leaves no more than 1% of the original fleas after use. What is the least number of fleas that the shampoo will remove?
Weekly Problem 10 - 2009
In how many ways can you give change for a ten pence piece?
Weekly Problem 1 - 2007
Three integers have a sum of 1 and a product of 36 - what are they?
When is the next time that Brian's age will be the reverse of his father's age?
Weekly Problem 16 - 2009
Arrange these three famous mathematicians in order with the shortest-lived first.
Sara makes a list of the whole numbers that do not contain any 9s. What is the 300th number on her list?
Weekly Problem 44 - 2007
Gill and I went to a restaurant for lunch to celebrate her birthday....We agreed to split the total cost equally. How much did I owe Gill?
Weekly Problem 21 - 2008
The sum of each column and row in this grid give the totals as shown. What number goes in the starred square?
Weekly Problem 27 - 2008
In the diagram in the question, how many squares, of any size, are there whose entries add up to an even total?