Quiz Questions
Age 11 to 14 Short
Challenge Level
Jack does a 20-question quiz. How many questions didn't he attempt?
Jenny's Logic
Age 11 to 14 Short
Challenge Level
Weekly Problem 52 - 2009
How did Jenny figure out that Tom's cards added to an even number?
Mini Kakuro
Age 11 to 14 Short
Challenge Level
The sum of each column and row in this grid give the totals as shown. What number goes in the starred square?
Newspaper Sheets
Age 14 to 16 Short
Challenge Level
From only the page numbers on one sheet of newspaper, can you work out how many sheets there are altogether?
Central Sum
Age 11 to 14 Short
Challenge Level
Can you find numbers between 100 and 999 that have a middle digit equal to the sum of the other two digits?
12345
Age 14 to 16 Short
Challenge Level
Repeat a pattern of numbers to form a larger number. Can you find the sum of all the digits?
Digit Deletion
Age 11 to 14 Short
Challenge Level
What is the largest number of digits that could be erased from this 1000-digit number, to get a surprising result?
Alberta's Age
Age 14 to 16 Short
Challenge Level
Alberta won't reveal her age. Can you work it out from these clues?
Double with 1 to 9
Age 11 to 14 Short
Challenge Level
Can you find a number and its double using the digits $1$ to $9$ only once each?
NRICH is part of the family of activities in the Millennium Mathematics Project.