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Spell by Numbers
Age 7 to 11
Challenge Level 
This was quite tricky but some of you made good solutions and told us how you worked them out.
Sarah from Tattingstone School said she started off with O because she could see that it left things unchanged. Here is her solution:
Can you follow her description of what she did?
Here is another one from her friend Marion. She started with a different idea but still gets the solution. Is one way quicker than the other?
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