### How Many Days?

How many days are there between February 25th 2000 and March 11th?

### 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.

### Calendars

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

# Planet Plex Time

## Planet Plex Time

On Planet Plex, there are only six hours in a day but the days of the week are the same as ours. Arog the alien lives on Planet Plex.

Here is a clock which shows how Arog spends each hour of the day during the week:

What time does school start?

Arog starts his dinner at $4$ o'clock. What will he be about to do two hours later? What was he about to do five hours earlier?

Arog gets into bed on Wednesday evening. How long is it until school finishes on Friday?

### Why do this problem?

This simple problem focuses on duration and will encourage learners to consider the passing of time in a different context.

### Key questions

Can you show me on the clock what time school starts?
Could you use the clock to count how many hours have passed?

### Possible extension

Children could have a go at the problem Times of Day.