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Speed Mathematics – from the horrors of a Concentration Camp


Can you multiply 5132437201 by 452736502785 in seventy seconds without using a calculator?

A Russian Jew, Jakow Trachtenberg, developed his system of “speed mathematics”¬†while he was in Hitler’s concentration camps as a political prisoner during World War II. Read more about this amazing Mathematician here. You can download a copy of his work at this link.

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NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]

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