You may also like

problem icon

Planet Plex Time

On Planet Plex, there are only 6 hours in the day. Can you answer these questions about how Arog the Alien spends his day?

problem icon

On What Day Did it Happen?

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.

problem icon


Calendars were one of the earliest calculating devices developed by civilizations. Find out about the Mayan calendar in this article.

How Many Days?

Stage: 1 Challenge Level: Challenge Level:1

Deniz from IRMAK Primary and Secondary School, Turkey says, "We can't count February 25th and March 11th because it says 'between'.

From 26th day to the 29th day of February, (29th day included) there are 4 days. 2000 is a leap year - that's why February takes 29 days.

From 1st day to the 11th day of March (11th day excluded) there are 10 days. The sum of these numbers is 14 days."