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It could be one of several things:

One is that the symbol "x" is used to indicate a binary operation other than conventional multiplication.

If multiplication IS in its "normal" form, it is possible that calculations are not in base 10. In base 7, for example, the answer would be 26.0

Or that calculations are modulo some number smaller than 20. Modulo 9, the answer would be 2.0

Or it could be the effect of rounding. For example 3.96 * 4.96 = 19.6416 so that rounded to 1 decimal place, this becomes 4.0 x 5.0 = 19.6 - not 20.0

It is very likely that there are other properties or scenarios.

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13y ago

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