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Sökt på: Böcker av G.W. Kelly
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Short-cut Mathematics
häftad,
2003,
Engelska,
ISBN 9780486246116
Can you multiply 362 x .5 quickly in your head? Could you readily calculate the square of 41? How much is 635 divided by 21/2? Can 727,648 be evenly divided by 8? If any of these …