Operations with Rational Numbers
An IV pump does not understand "about half." A patient's 24-hour intake and output chart does not forgive a misplaced negative sign. When calculating a weight-based pediatric dose, the difference between and is the difference between a therapeutic intervention and a critical medical error. Mathematics in healthcare is an exact science of proportions, changes, and measurements, all fundamentally built upon a system of numbers that behave predictably under strict rules. This comprehensive system is the domain of rational numbers.
To master the ATI TEAS 7, you must stop viewing math as a series of arbitrary hurdles and start seeing it as a language that describes reality. We are going to deconstruct how rational numbers interact—how they combine, scale, and divide—so that when you sit for your exam, the mechanics of these operations are second nature.