These algorithms for floating computation feel completely familiar (except for the base 60 part) to a user of a slide rule. For instance, there is the complete

These algorithms for floating computation feel completely familiar (except for the base 60 part) to a user of a slide rule. For instance, there is the completely separate method for addition/subtraction versus multiplication/division. With a slide rule, you do addition by longhand but multiplication on the slide rule. With Mesopotamian math, you have one notation for numbers you add and another for numbers you multiply. Also, the thing with scale being very fluid. With a slide rule, you always have order of magnitude in the back of your head. Same with SPGN.