Watch our videos of multiplication methods that you may not have met before. Can you make sense of them?
When the number x 1 x x x is multiplied by 417 this gives the answer 9 x x x 0 5 7. Find the missing digits, each of which is represented by an "x" .
The number 10112359550561797752808988764044943820224719 is called a 'slippy number' because, when the last digit 9 is moved to the front, the new number produced is the slippy number multiplied by 9.
This challenge is to make up YOUR OWN alphanumeric. Each letter represents a digit and where the same letter appears more than once it must represent the same digit each time.
This addition sum uses all ten digits 0, 1, 2...9 exactly once. Find the sum and show that the one you give is the only possibility.
Find the numbers in this sum
Countries from across the world competed in a sports tournament. Can you devise an efficient strategy to work out the order in which they finished?
Read this article to find out the mathematical method for working out what day of the week each particular date fell on back as far as 1700.
Scheduling games is a little more challenging than one might desire. Here are some tournament formats that sport schedulers use.