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Weekly Problem 52 - 2009
How did Jenny figure out that Tom's cards added to an even number?

What is the largest number of digits that could be erased from this 1000-digit number, to get a surprising result?

Weekly Problem 29 - 2010
An isosceles triangle is drawn inside another triangle. Can you work out the length of its base?

Can you work out the fraction of the larger square that is covered by the shaded area?

Can you remove the least number of points from this diagram, so no three of the remaining points are in a straight line?

What percentage of the integers between 1 and 10,000 are square numbers?

What percentage of a quarter is a fifth?

Weekly Problem 7 - 2013
Three of the angles in this diagram all have size $x$. What is the value of $x$?

If all the arrangements of the letters in the word ANGLE are written down in alphabetical order, what position does the word ANGLE occupy?

How many three digit numbers formed with three different digits from 0, 1, 2, 3 and 5 are divisible by 6?