Start with 512
Halve it to get 256
Halve it to get 128
  
Continue as far as possible
[Decimal fractions are allowed but calculators are not]
Topics: Starter  Arithmetic  Number
How far can you get? Fantastic work from Eva. We love the @Transum maths starters of the day. pic.twitter.com/PtRzyw7Hwe
— St Bernadette's P6/7 (@stb_rcp6p7) March 7, 2018
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Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Here is the URL which will provide a little light relief. It is a game based on the sequence of doubling numbers but might be best left till the last five minutes of the lesson as it is quite addictive!