Weekly Problem 23 - 2011
MatildaMatildaMatil... What is the 1000th letter?
Weekly Problem 14 - 2016
In a supermarket, there are two lines of tightly packed trolleys. What is the length of one trolley?
Weekly Problem 20 - 2008
Grannie's watch gains 30 minutes every hour, whilst Grandpa's watch loses 30 minutes every hour. What is the correct time when their watches next agree?
Weekly Problem 30 - 2016
The robot Lumber9 moves along the number line. Where will the robot be after 2011 slides?
Weekly Problem 27 - 2010
This pattern repeats every 12 dots. Can you work out what a later piece will be?
Weekly Problem 42 - 2012
What number appears immediately below 400 in the triangle?
Weekly Problem 51 - 2016
Pegs numbered 1 to 50 are placed in a row. Alternate pegs are knocked down, and this process is repeated. What is the number of the last peg to be knocked down?
Weekly Problem 40 - 2012
What is the first term of a Fibonacci sequence whose second term is 4 and fifth term is 22?
Weekly Problem 35 - 2010
Knights always tell the truth. Knaves always lie. Can you catch these knights and knaves out?
Weekly Problem 8 - 2017
A pattern repeats every six symbols. What are the 100th and 101st symbols?
Weekly Problem 50 - 2011
Repeat a pattern of numbers to form a larger number. Can you find the sum of all the digits?
Weekly Problem 36 - 2010
How many squares are needed to continue this pattern?
Weekly Problem 9 - 2007
Walking up a steep hill, I pass 10 equally spaced street lamps. How long do I take to walk from the first lamp to the last?
Weekly Problem 8 - 2011
This grocer wants to arrange his fruit in a particular order, can you help him?
Weekly Problem 5 - 2016
How many hexagons are required for the perimeter of the whole shape to have length 1002cm?
Weekly Problem 31 - 2007
Trinni rearanges numbers on a clock face so each adjacent pair add up to a triangle number... What number did she put where 6 would usually be?
Weekly Problem 17 - 2011
Every third page number in this book has been omitted. Can you work out what number will be on the last page?
Weekly Problem 6 - 2016
Luis writes down seven consecutive positive integers. The sum of the three smallest numbers is 33. What is the sum of the three largest numbers?
Weekly Problem 1 - 2008
Given that the number 2008 is the correct answer to a sum, can you find n?
Weekly Problem 41 - 2012
The fifth term of a Fibbonaci sequence is 2004. If all the terms are positive integers, what is the largest possible first term?
Weekly Problem 44 - 2012
Consider two arithmetic sequences: 1998, 2005, 2012,... and 1996, 2005, 2014,... Which numbers will appear in both?
Weekly Problem 46 - 2012
If a number is even, halve it; if odd, treble it and add 1. If a sequence starts at 13, what will be the value of the 2008th term?
Weekly Problem 51 - 2017
How many numbers less than 2017 are both the sum of two consecutive integers and the sum of five consecutive integers?
Weekly Problem 51 - 2006
Can you work out which number will appear directly below 400 in this pattern?
Weekly Problem 52 - 2010
Leonard writes down a sequence of numbers. Can you find a formula to predict the seventh number in his sequence?
Weekly Problem 35 - 2014
A sequence is generated using these rules. For which values of n is the nth term equal to n?