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### Number and algebra

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### Working mathematically

### For younger learners

### Advanced mathematics

# How Many Days?

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

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### Planet Plex Time

### On What Day Did it Happen?

### Calendars

Links to the University of Cambridge website
Links to the NRICH website Home page

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Age 5 to 7

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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**."

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

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.

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