Throughout history, people have measured time. Some of the units of time that are used today are based on the movements of the Sun and the Earth. The Babylonians and Egyptians first divided the daytime into 12 equal hours and the night time into another 12 equal hours, giving us a 24 hour day. This is why mechanical clocks, when invented, went round 12 hours during the morning and another 12 hours in the evening. The Babylonians then divided each hour into 60 smaller minutes and divided the minutes into even smaller seconds.

This clip is from:
The Maths Channel, Time
First broadcast:
22 June 2007

The clip would benefit from being paused halfway through so the children have time to work out the problem before the answer is given. Children who need extra support could be shown a little more of the clip to aid them in answering the question. This clip would be useful as part of a starter or plenary session and could also be used on a laptop set up as a challenge corner. Children could use the clip as a stimulus and devise their own real life time problems based on the number of hours they spend at school or their parents spend at work. Can those of higher ability work out how many seconds there are in a week or a month?