How to multiply any double digit number by 11 a super maths trick to astound and confound. I said out loud 'why was I never taught this at school?' So now sharing it with you.
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I was taught this trick by my father years ago. The formula also works for 3+ digits as well. Good task for more able is to pose the question "Why does this work?"
A neat trick!
I'm sure there are a lot more useful 'tricks' like this...if only we knew about them...
This is a useful resource and has been selected to feature on the @TESPrimary twitter feed over the next week. Thank you so much for sharing, you are helping to inspire teachers and students all over the world!
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