When written as a word or words, what is the smallest positive whole number containing the
letter 'a'?
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Idea for Teacher: Another way to present this idea is to challenge pupils to write down in one minute as many words as possible that do not contain the letter A . You can easily win this competition by writing down one, two, three, four etc which is much easier to do!
Teacher, do your students have
access to computers? 

Here a concise URL for a version of this page without the comments.
Transum.org/go/?Start=October7
Here is the URL which will take them to a related activity.
What is the largest number that has only one syllable?
When written as a word or words, what is the smallest positive whole number containing all of the vowels?
When written as a word or words, what is the only prime number that does not contain the letter 'e'?
When written as a word or words, what is the largest positive whole number that does not contain the letter 'o'?
When written as a word or words, what is the largest positive whole number that does not contain the letter 'i'?
The solutions to this and other Transum puzzles, exercises and activities are available here when you are signed in to your Transum subscription account. If you do not yet have an account and you are a teacher, tutor or parent you can apply for one here.
If you enjoyed this type of number puzzle you might like to look at the June 2016 Transum Newsletter which featured a similar challenge as the puzzle of the month.