Test Bank – 1,200 Original Drug Dosage Calculation Questions & Detailed Rationales | Aligned with
Calculating Drug Dosages, 3rd Edition by Martinez de Castillo & Werner-McCullough
Page 1
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Coverage
• Unit 1: Math Foundations and Patient-Safety Checks — 100 questions
• Unit 2: Metric, Household, and Weight Conversions — 100 questions
• Unit 3: Medication Labels, Orders, and Safe Notation — 100 questions
• Unit 4: Oral Solid and Liquid Dosages — 100 questions
• Unit 5: Parenteral Dosages and Syringe Selection — 100 questions
• Unit 6: Reconstitution and Solutions — 100 questions
• Unit 7: Intake, Output, and Patient-Assessment Calculations — 100 questions
• Unit 8: Basic IV Pump Rates and Infusion Duration — 100 questions
• Unit 9: Gravity IV Flow Rates — 100 questions
• Unit 10: High-Alert Units and Titrated Infusions — 100 questions
• Unit 11: Pediatric Weight-Based and Safe-Dose Calculations — 100 questions
• Unit 12: Comprehensive Patient-Safe Clinical Calculations — 100 questions
Page 2
,Unit 1: Math Foundations and Patient-Safety Checks
1. Calculate 47.11 ÷ 15.88. Round only if needed to three decimal places.
A. 3.967
B. 2.967
C. 29.666
D. 1.967
Answer: B — 2.967
Detailed rationale: Perform the division while preserving place value. The unrounded result is
2.966625; after appropriate rounding, the answer is 2.967. Premature rounding can create medication-
dose error. Calculation reasoning: keep the units visible through the setup so incompatible units are
converted before arithmetic and the unwanted units cancel. Round only at the final step unless the
problem or institutional policy specifies otherwise, then perform a reasonableness check against the
ordered dose, available concentration, route, and clinical context. Why the distractors are incorrect:
alternative numeric choices commonly result from reversing desired and available quantities, omitting a
conversion, multiplying instead of dividing, using the wrong time unit, or rounding too early.
2. What is 40% of 500?
A. 460
B. 205
C. 20
D. 200
Answer: D — 200
Detailed rationale: Convert 40% to 0.4 and multiply by 500. 0.4 × 500 = 200. Percent means “per 100,”
so dividing the percent by 100 before multiplying prevents a tenfold or hundredfold error. Clinical
reasoning: first identify exactly what the stem is testing—such as drug class, mechanism, indication,
expected effect, adverse reaction, contraindication, monitoring priority, or patient teaching—then select
the option that answers that dimension most directly. Safety connection: the correct response links
pharmacology knowledge to prevention of medication error, recognition of toxicity or deterioration, and
appropriate follow-up. Why the distractors are incorrect: some alternatives may describe a different
property of the drug or class, while others conflict with the requested clinical priority or with safe
medication-use principles.
3. Calculate 9/10 - 1/8. Give the answer in simplest form.
A. 3/4
B. 31/40
C. 2/3
Page 3
, D. 1/2
Answer: B — 31/40
Detailed rationale: Convert to compatible fractions or multiply numerators and denominators as
required. The exact result simplifies to 31/40; reducing the fraction removes common factors and gives
the safest form for later dosage work. Calculation reasoning: keep the units visible through the setup so
incompatible units are converted before arithmetic and the unwanted units cancel. Round only at the
final step unless the problem or institutional policy specifies otherwise, then perform a reasonableness
check against the ordered dose, available concentration, route, and clinical context. Why the distractors
are incorrect: alternative numeric choices commonly result from reversing desired and available
quantities, omitting a conversion, multiplying instead of dividing, using the wrong time unit, or rounding
too early.
4. What is 75% of 200?
A. 125
B. 155
C. 150
D. 15
Answer: C — 150
Detailed rationale: Convert 75% to 0.75 and multiply by 200. 0.75 × 200 = 150. Percent means “per
100,” so dividing the percent by 100 before multiplying prevents a tenfold or hundredfold error. Clinical
reasoning: first identify exactly what the stem is testing—such as drug class, mechanism, indication,
expected effect, adverse reaction, contraindication, monitoring priority, or patient teaching—then select
the option that answers that dimension most directly. Safety connection: the correct response links
pharmacology knowledge to prevention of medication error, recognition of toxicity or deterioration, and
appropriate follow-up. Why the distractors are incorrect: some alternatives may describe a different
property of the drug or class, while others conflict with the requested clinical priority or with safe
medication-use principles.
5. What is 75% of 250?
A. 18.75
B. 175
C. 192.5
D. 187.5
Answer: D — 187.5
Detailed rationale: Convert 75% to 0.75 and multiply by 250. 0.75 × 250 = 187.5. Percent means “per
100,” so dividing the percent by 100 before multiplying prevents a tenfold or hundredfold error. Clinical
Page 4
Calculating Drug Dosages, 3rd Edition by Martinez de Castillo & Werner-McCullough
Page 1
,.
Coverage
• Unit 1: Math Foundations and Patient-Safety Checks — 100 questions
• Unit 2: Metric, Household, and Weight Conversions — 100 questions
• Unit 3: Medication Labels, Orders, and Safe Notation — 100 questions
• Unit 4: Oral Solid and Liquid Dosages — 100 questions
• Unit 5: Parenteral Dosages and Syringe Selection — 100 questions
• Unit 6: Reconstitution and Solutions — 100 questions
• Unit 7: Intake, Output, and Patient-Assessment Calculations — 100 questions
• Unit 8: Basic IV Pump Rates and Infusion Duration — 100 questions
• Unit 9: Gravity IV Flow Rates — 100 questions
• Unit 10: High-Alert Units and Titrated Infusions — 100 questions
• Unit 11: Pediatric Weight-Based and Safe-Dose Calculations — 100 questions
• Unit 12: Comprehensive Patient-Safe Clinical Calculations — 100 questions
Page 2
,Unit 1: Math Foundations and Patient-Safety Checks
1. Calculate 47.11 ÷ 15.88. Round only if needed to three decimal places.
A. 3.967
B. 2.967
C. 29.666
D. 1.967
Answer: B — 2.967
Detailed rationale: Perform the division while preserving place value. The unrounded result is
2.966625; after appropriate rounding, the answer is 2.967. Premature rounding can create medication-
dose error. Calculation reasoning: keep the units visible through the setup so incompatible units are
converted before arithmetic and the unwanted units cancel. Round only at the final step unless the
problem or institutional policy specifies otherwise, then perform a reasonableness check against the
ordered dose, available concentration, route, and clinical context. Why the distractors are incorrect:
alternative numeric choices commonly result from reversing desired and available quantities, omitting a
conversion, multiplying instead of dividing, using the wrong time unit, or rounding too early.
2. What is 40% of 500?
A. 460
B. 205
C. 20
D. 200
Answer: D — 200
Detailed rationale: Convert 40% to 0.4 and multiply by 500. 0.4 × 500 = 200. Percent means “per 100,”
so dividing the percent by 100 before multiplying prevents a tenfold or hundredfold error. Clinical
reasoning: first identify exactly what the stem is testing—such as drug class, mechanism, indication,
expected effect, adverse reaction, contraindication, monitoring priority, or patient teaching—then select
the option that answers that dimension most directly. Safety connection: the correct response links
pharmacology knowledge to prevention of medication error, recognition of toxicity or deterioration, and
appropriate follow-up. Why the distractors are incorrect: some alternatives may describe a different
property of the drug or class, while others conflict with the requested clinical priority or with safe
medication-use principles.
3. Calculate 9/10 - 1/8. Give the answer in simplest form.
A. 3/4
B. 31/40
C. 2/3
Page 3
, D. 1/2
Answer: B — 31/40
Detailed rationale: Convert to compatible fractions or multiply numerators and denominators as
required. The exact result simplifies to 31/40; reducing the fraction removes common factors and gives
the safest form for later dosage work. Calculation reasoning: keep the units visible through the setup so
incompatible units are converted before arithmetic and the unwanted units cancel. Round only at the
final step unless the problem or institutional policy specifies otherwise, then perform a reasonableness
check against the ordered dose, available concentration, route, and clinical context. Why the distractors
are incorrect: alternative numeric choices commonly result from reversing desired and available
quantities, omitting a conversion, multiplying instead of dividing, using the wrong time unit, or rounding
too early.
4. What is 75% of 200?
A. 125
B. 155
C. 150
D. 15
Answer: C — 150
Detailed rationale: Convert 75% to 0.75 and multiply by 200. 0.75 × 200 = 150. Percent means “per
100,” so dividing the percent by 100 before multiplying prevents a tenfold or hundredfold error. Clinical
reasoning: first identify exactly what the stem is testing—such as drug class, mechanism, indication,
expected effect, adverse reaction, contraindication, monitoring priority, or patient teaching—then select
the option that answers that dimension most directly. Safety connection: the correct response links
pharmacology knowledge to prevention of medication error, recognition of toxicity or deterioration, and
appropriate follow-up. Why the distractors are incorrect: some alternatives may describe a different
property of the drug or class, while others conflict with the requested clinical priority or with safe
medication-use principles.
5. What is 75% of 250?
A. 18.75
B. 175
C. 192.5
D. 187.5
Answer: D — 187.5
Detailed rationale: Convert 75% to 0.75 and multiply by 250. 0.75 × 250 = 187.5. Percent means “per
100,” so dividing the percent by 100 before multiplying prevents a tenfold or hundredfold error. Clinical
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