If you like old calculator hacks, you might be interested to know that some early calculators (such as those from Wang[1]) could natively perform only addition,

If you like old calculator hacks, you might be interested to know that some early calculators (such as those from Wang[1]) could natively perform only addition, subtraction, e^x, and the natural log. So to multiply numbers, they took e^(ln(a) + ln(b)). See also: factor combining [2] [1]: https://en.wikipedia.org/wiki/Wang_Laboratories https://en.wikipedia.org/wiki/Wang_Laboratories [2]: https://en.wikipedia.org/wiki/CORDIC#Factor_combining https://en.wikipedia.org/wiki/CORDIC#Factor_combining