07. How To Multiply Large Numbers In Your Head
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08. How To Remember Which Sign Is Greater Than and Which Is Less Than
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09. How To Find Fractions Of Whole Numbers
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10. How To Multiply By 11
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11. How To Use Your Hands For 5, 6, and 9 Times Tables
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12. Use Lines To Multiply
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The above is actually a method used often by the Japanese. Here is video for better demonstration:
