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Forget what you know: Jacob Barnett at TEDxTeen
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One minus one plus one minus one - Numberphile
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You're Not Bad At Math, You're Just Lazy
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It's MATHEMAGIC! Look Like a Math GENIUS! - Scam School
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Faster than a calculator | Arthur Benjamin | TEDxOxford
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Times table trick using your hands
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Math Trick - Multiply Using Lines!
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Mental Math Tricks - How to multiply in your head!
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Fast Math Tricks - How to multiply 2 digit numbers up to 100 - the fast way!
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Fast Mental Multiplication Trick - multiply in your head using base 10
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Fun Math Tricks - Finding Date of birth
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Fast Math Trick
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How to trick your math teacher