Math Shortcuts tricks, ADDITION,SUBTRACTION,MULTIPLICATION,DIVISION,SQUARING,SUMMATIONS

Math Shortcuts tricks, ADDITION,SUBTRACTION,MULTIPLICATION,DIVISION,SQUARING, SUMMATIONS > 1. ADDITION X+Y; Y= 91~109, 191~209, 291~309 >2. SUBTRACTION Y-X; Y = 100, 1000, 10000 X-Y; Y = 91~109, 191~209, 291~309 >3. MULTIPLICATION X*11 X*Y;…

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