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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The nine digit number is 854917632
There are two different answers to question 4.
Either: "You can halve it as many times as you like but will get 427458816 every time!"
What are the prime factors of 854917632?
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.