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We had just one solution sent in from Aaron at Oak Heights Mustangs in the US.
He wrote the following:
I clicked on a number and if I got it wrong I would memorize that number and if I see something that matches that number I would put those two into a pair.
I would count the number on each card and keep reminding myself that number is there.
This article for pupils explores what makes numbers special or lucky, and looks at the numbers that are all around us every day.