### Times

Which times on a digital clock have a line of symmetry? Which look the same upside-down? You might like to try this investigation and find out!

### Clock Hands

This investigation explores using different shapes as the hands of the clock. What things occur as the the hands move.

### Ten Green Bottles

Do you know the rhyme about ten green bottles hanging on a wall? If the first bottle fell at ten past five and the others fell down at 5 minute intervals, what time would the last bottle fall down?

# Millennium Man

### Why do this problem?

This problem is a challenging one for children who are familiar with the measurement of time and calendars.

### Key questions

How often do leap years occur?
What day of the week was the 1st January 2001 ... 1st January 2002 etc.?
What happens after $28$ years?