3 out of 3
What is the largest number of digits that could be erased from this 1000-digit number, to get a surprising result?
2 out of 3
How much more antifreeze is needed to make the proportion 30%?
2 out of 3
A car with 5 tyres (four road tyres and a spare) travelled 30,000 km. All 5 tyres were used equally. How many kilometres' wear did each tyre receive?
2 out of 3
Think of any whole number. Each time you perform a sequence of operations on it, what do you notice about the divisors of your answer?
2 out of 3
A sequence is generated using these rules. For which values of n is the nth term equal to n?
1 out of 3
Weekly Problem 8 - 2008
In how many ways can a square be cut in half using a single straight line cut?
1 out of 3
Weekly Problem 21 - 2009
What is the angle between the two hands of a clock at 2.30?
2 out of 3
Weekly Problem 7 - 2013
Three of the angles in this diagram all have size $x$. What is the value of $x$?
2 out of 3
Weekly Problem 39 - 2008
How big is the angle between the hour hand and the minute hand of a clock at twenty to five?
2 out of 3
Weekly Problem 2 - 2009
The 16 by 9 rectangle is cut as shown. Rearrange the pieces to form a square. What is the perimeter of the square?
