problem 1: Add 12ten to 15ten in binary and then subtract 12ten from 15ten in binary.
problem 2: Using 4-bit numbers to save space, multiply 3ten x 4ten in binary.
problem 3: Using a 4-bit version of the algorithm to save space, divide 5ten by 3ten in binary.
problem 4: Add 3.76ten x 100 to 3.45ten x 102, assuming that we have three significant decimal digits. Round to the nearest decimal number with three significant decimal digits, first with guard and round digits, and then without them.