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Chapter 3 – Mathematics Review and Introduction to Dosage Calculation (2025/2026) | Nursing Math, Drug Dosage, and Medication Calculation Study Guide

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The Chapter 3: Mathematics Review and Introduction to Dosage Calculation (2025/2026 Edition) is a detailed and essential study guide for nursing and healthcare students learning medication math and dosage calculation skills. This comprehensive review covers basic arithmetic, ratio and proportion, dimensional analysis, conversions between metric, household, and apothecary systems, and step-by-step dosage calculation methods. It helps students master safe medication administration practices through clear examples, practice problems, and error prevention strategies. Ideal for nursing, pharmacology, and medical assisting courses, this resource builds confidence and accuracy in drug dosage calculation and clinical math, aligning with the latest ATI, HESI, and NCLEX-RN standards for safe patient care.

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Chapter 3: Mathematics Review and Introduction to
Dosage Calculation




the part of a whole number based on a system of units of ten (ex: 0.5 is
5 tenths of 1)
decimal




the dividing point between whole numbers and parts of numbers in a
system based on units of ten.
decimal point




the bottom number in a fraction, the dividing number
denominator




the number to be divided in a division problem.
dividend




the number the dividend is divided by or that is divided into the
dividend.
divisor

, a part of a whole number obtained by dividing one number by a larger
number.
fraction




a fraction that has a top number that is larger than the bottom number.
improper fraction




drug delivery into the body by injection just under the top part of the
skin.
intradermal (ID)




drug delivery into the body by injection into the muscle.
intramuscular (IM)




whole numbers with a fraction attached
mixed-number fractions




the top number in a fraction that is divided by the bottom number
numerator

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