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Medical Mathematics and Dosage Calculations Flashcards

7 cards from real RMA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. An order reads: Infuse 250 mL of NS over 2 hours using a 10 gtt/mL IV set. What is the flow rate in drops per minute?

    Answer: 21 gtt/min

    (250 mL × 10 gtt/mL) ÷ (2 hrs × 60 min) = 2,500 ÷ 120 ≈ 21 gtt/min.

  2. Convert 37°C to Fahrenheit using the formula F = (C × 9/5) + 32.

    Answer: 98.6°F

    (37 × 9/5) + 32 = 66.6 + 32 = 98.6°F, which is normal body temperature.

  3. Which metric prefix represents one-thousandth (0.001) of the base unit?

    Answer: Milli-

    The prefix milli- denotes 1/1,000 (0.001) of the base unit, as in milligram or milliliter.

  4. A patient is ordered 0.4 mg of atropine IM. The vial contains 0.8 mg/mL. How many mL should be administered?

    Answer: 0.5 mL

    (0.4 mg ÷ 0.8 mg/mL) × 1 mL = 0.5 mL.

  5. How many teaspoons are equivalent to 1 tablespoon?

    Answer: 3 teaspoons

    1 tablespoon equals 3 teaspoons; since 1 teaspoon = 5 mL, 1 tablespoon = 15 mL.

  6. A child weighs 44 lbs. Using Clark's Rule (child's weight in lbs ÷ 150 × adult dose), what is the child's dose if the adult dose is 300 mg?

    Answer: 88 mg

    (44 ÷ 150) × 300 mg = 0.293 × 300 = 88 mg.

  7. In the apothecary system, 1 grain is approximately equivalent to how many milligrams?

    Answer: 60 mg

    1 grain (gr) is approximately equal to 60 mg in the standard apothecary-to-metric conversion.