1
HESI A2 Dosage Math Mastery: Fractions, Decimals, and
Percents Exam Bank
Table of Contents
Subtopic 1: Converting Between Fractions, Decimals, and Percents ................................. 2
Subtopic 2: Calculating Drug Dosages Using Fractions, Decimals, and Percents ............... 9
Subtopic 3: Comparing and Ordering Fractions, Decimals, and Percents in Clinical
Scenarios ................................................................................................................... 17
Subtopic 4: Real-World Applications of Fractions, Decimals, and Percents in Patient Care
.................................................................................................................................. 25
Subtopic 5: Intravenous (IV) Flow Rate and Infusion Calculations Using Fractions,
Decimals, and Percents............................................................................................... 33
Subtopic 6: Pediatric Dosage Calculations Using Fractions, Decimals, and Percents ....... 41
Subtopic 7: Reconstitution and Dilution Calculations Using Fractions, Decimals, and
Percents ..................................................................................................................... 49
Subtopic 8: Calculating Dosages Based on Body Weight Using Fractions, Decimals, and
Percents ..................................................................................................................... 57
Subtopic 9: Critical Care Dosage Adjustments – Infusion Rates, Percents, and Weight-
Based Conversions ..................................................................................................... 65
Subtopic 10: Error Prevention and Safe Dosage Calculations – Fractions, Decimals, and
Percents in Risk Reduction .......................................................................................... 73
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Subtopic 1: Converting Between Fractions, Decimals, and
Percents
Question 1
Convert 0.375 to a fraction in simplest form.
A. 3/5
B. 7/16
C. 3/8
D. 5/12
Correct Answer: C. 3/8
Rationale: 0.375 = 375/1000 = 3/8 after simplifying by dividing numerator and denominator
by 125.
Question 2
What is ⅗ as a decimal?
A. 0.6
B. 0.35
C. 0.75
D. 0.5
Correct Answer: A. 0.6
Rationale: Divide 3 by 5 → 3 ÷ 5 = 0.6.
Question 3
Convert 80% to a decimal.
A. 0.008
, 3
B. 0.08
C. 0.8
D. 8.0
Correct Answer: C. 0.8
Rationale: Divide percent by 100 → 80 ÷ 100 = 0.8.
Question 4
Convert 0.45 to a percent.
A. 0.45%
B. 4.5%
C. 45%
D. 450%
Correct Answer: C. 45%
Rationale: Multiply decimal by 100 → 0.45 × 100 = 45%.
Question 5
Which of the following is equivalent to ⅞?
A. 0.75
B. 0.875
C. 0.8
D. 0.85
Correct Answer: B. 0.875
Rationale: 7 ÷ 8 = 0.875.
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Question 6
What is 0.25 as a fraction in simplest form?
A. 1/4
B. 2/5
C. 5/8
D. 3/10
Correct Answer: A. 1/4
Rationale: 0.25 = 25/100 = 1/4 when simplified.
Question 7
Express ⅚ as a percentage.
A. 75%
B. 83.33%
C. 66.67%
D. 60%
Correct Answer: B. 83.33%
Rationale: 5 ÷ 6 = 0.8333 → 0.8333 × 100 = 83.33%.
Question 8
Which decimal is equivalent to 2/5?
A. 0.35
B. 0.4
C. 0.45
HESI A2 Dosage Math Mastery: Fractions, Decimals, and
Percents Exam Bank
Table of Contents
Subtopic 1: Converting Between Fractions, Decimals, and Percents ................................. 2
Subtopic 2: Calculating Drug Dosages Using Fractions, Decimals, and Percents ............... 9
Subtopic 3: Comparing and Ordering Fractions, Decimals, and Percents in Clinical
Scenarios ................................................................................................................... 17
Subtopic 4: Real-World Applications of Fractions, Decimals, and Percents in Patient Care
.................................................................................................................................. 25
Subtopic 5: Intravenous (IV) Flow Rate and Infusion Calculations Using Fractions,
Decimals, and Percents............................................................................................... 33
Subtopic 6: Pediatric Dosage Calculations Using Fractions, Decimals, and Percents ....... 41
Subtopic 7: Reconstitution and Dilution Calculations Using Fractions, Decimals, and
Percents ..................................................................................................................... 49
Subtopic 8: Calculating Dosages Based on Body Weight Using Fractions, Decimals, and
Percents ..................................................................................................................... 57
Subtopic 9: Critical Care Dosage Adjustments – Infusion Rates, Percents, and Weight-
Based Conversions ..................................................................................................... 65
Subtopic 10: Error Prevention and Safe Dosage Calculations – Fractions, Decimals, and
Percents in Risk Reduction .......................................................................................... 73
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Subtopic 1: Converting Between Fractions, Decimals, and
Percents
Question 1
Convert 0.375 to a fraction in simplest form.
A. 3/5
B. 7/16
C. 3/8
D. 5/12
Correct Answer: C. 3/8
Rationale: 0.375 = 375/1000 = 3/8 after simplifying by dividing numerator and denominator
by 125.
Question 2
What is ⅗ as a decimal?
A. 0.6
B. 0.35
C. 0.75
D. 0.5
Correct Answer: A. 0.6
Rationale: Divide 3 by 5 → 3 ÷ 5 = 0.6.
Question 3
Convert 80% to a decimal.
A. 0.008
, 3
B. 0.08
C. 0.8
D. 8.0
Correct Answer: C. 0.8
Rationale: Divide percent by 100 → 80 ÷ 100 = 0.8.
Question 4
Convert 0.45 to a percent.
A. 0.45%
B. 4.5%
C. 45%
D. 450%
Correct Answer: C. 45%
Rationale: Multiply decimal by 100 → 0.45 × 100 = 45%.
Question 5
Which of the following is equivalent to ⅞?
A. 0.75
B. 0.875
C. 0.8
D. 0.85
Correct Answer: B. 0.875
Rationale: 7 ÷ 8 = 0.875.
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Question 6
What is 0.25 as a fraction in simplest form?
A. 1/4
B. 2/5
C. 5/8
D. 3/10
Correct Answer: A. 1/4
Rationale: 0.25 = 25/100 = 1/4 when simplified.
Question 7
Express ⅚ as a percentage.
A. 75%
B. 83.33%
C. 66.67%
D. 60%
Correct Answer: B. 83.33%
Rationale: 5 ÷ 6 = 0.8333 → 0.8333 × 100 = 83.33%.
Question 8
Which decimal is equivalent to 2/5?
A. 0.35
B. 0.4
C. 0.45
