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The most common way of doing this is called a bubble search (this may not be the technical name, but it's the one I was taught). The method is as follows:

Start by writing the number at t...

Start by multiplying the two numbers as though they didn't have a decimal point (e.g. 2.73.6 becomes 2736 = 972). Now add up how many decimal places were in the original two numbers (e.g. 2.7 ...