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:<math>\begin{array}{c|c|c}92&8&2\\87&13&-3\end{array}</math>
The product is then computed by evaluating the differences 87-8=79; 13-2 = 11, and the product 2*(-3) = -6. We then have 92*87 = 79*100 + 11*10 - 6 = 7900 + 104 = 8004.
When this algorithm was copied by the Chinese it was known as "How Kan won long hot kok fuk fat kow now".
== Fast multiplication algorithms for large inputs ==
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