# Why ADCs Use Integer Math

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In everyday life, we encounter apparently continuous variables such as voltage, current, charge, light intensity, flow rate, speed, and so on. All of these quantities are usually expressed as real numbers with units, such as 2.17 volts, 3.15 milliamperes, 0.05 Coulombs, 1.34 nanowatt cm^{-2}, milliliters s^{-1}, 20.2 meters s^{-1}, etc. So why wouldn't one want to digitize measurements using numbers with decimal points instead of simply integers?