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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Topics: Starter  Arithmetic  Number
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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!"
Or: "Nine"
427458816
213729408
106864704
53432352
26716176
13358088
6679044
3339522
1669761
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.
2^{9}×3^{3}×61843