1. Arrange the digits from 1 to 9 in alphabetical order.
2. Memorise the large number you have created.
3. Close your eyes, can you remember it?
4. How many times can you halve this number (without a calculator) to give a whole number answer?
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What are the prime factors of this large alphabetical number?
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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 take them to an activity about recognising prime numbers.