101 Shortcuts in Math Any One Can Do
101 Shortcuts in Math Any One Can Do
Short cuts in addition, multiplication, substraction, division, fractions, mixes numbers, percentage...all in your head (without calculator)
Wednesday, August 19, 2009
101 Shortcuts in Math Any One Can Do
Short cuts in addition, multiplication, substraction, division, fractions, mixes numbers, percentage...all in your head (without calculator)
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