Shop Math PDF | PDF | Fraction (Mathematics) | Machining 10 Adding and Subtracting Decimals 12 Shop Math and Part Prints 14 Formulas 19 Speed Formulas 20 Feed Rate Formulas 23 Tapping 27 Other Useful Formulas 29 Decimal Equivalent Chart 30 fIntroduction to Shop Math In every machine shop there is one skill that is required to know no matter what type of machining you are performing. That skill is math.