 This is a mathematical snack from the Association of Teachers of Mathematics. An alien visits Earth at midnight. Her clock is divided into 10 hours. Each hour is divided into 100 minutes. She asks you what time it is. You tell her it's midnight. She sets her clock with both hands pointing to the top. What time does the alien's clock say when Earth time is six o'clock? It's gone halfway round. So I guess that the alien time would be five o'clock. I'm going to write that down. Can you work out what time the alien time would be when Earth time is nine o'clock or one thirty or four o'clock? And now can you work out what time it is on Earth when the alien clock says two fifty, six fifty and four o'clock? I'll leave it to you.