HESI A2 Math Exam 2025/2026 –
Full Q&A with Step-by-Step
Rationales
Question 1: Unit Conversions (Metric)
Convert 2.5 liters to milliliters.
A. 250 mL
B. 2,500 mL
C. 25 mL
D. 250,000 mL
B. 2,500 mL
Rationale: To convert liters to milliliters, multiply by 1,000 (since 1 L = 1,000 mL). Step 1:
2.5 × 1,000 = 2,500. Thus, 2.5 L = 2,500 mL. This is critical for IV fluid administration in
nursing practice.
Question 2: Ratios
A nurse mixes 1 part saline to 3 parts dextrose. If 4 parts total 200 mL, what is the saline
volume?
A. 50 mL
B. 150 mL
C. 100 mL
D. 200 mL
A. 50 mL
Rationale: The ratio is 1:3, so saline is 1/4 of total. Step 1: Total parts = 4. Step 2: Saline
fraction = 1/4. Step 3: 1/4 × 200 mL = 50 mL. Ratios ensure accurate solution preparation.
,Question 3: Fractions
Add 1/2 + 1/3.
A. 2/5
B. 5/6
C. 1/6
D. 2/3
B. 5/6
Rationale: Common denominator is 6. Step 1: 1/2 = 3/6. Step 2: 1/3 = 2/6. Step 3: 3/6 + 2/6 =
5/6. Fractions are used in dividing medications or time.
Question 4: Word Problem
A patient needs 1,200 calories daily. If breakfast is 1/3 of total, how many calories for
breakfast?
A. 400 calories
B. 300 calories
C. 600 calories
D. 200 calories
A. 400 calories
Rationale: Breakfast = 1/3 of 1,200. Step 1: 1/3 × 1,200 = 400. This applies to nutritional
planning in patient care.
Question 5: Dosage Calculation
Order: 500 mg antibiotic q6h. Available: 250 mg/5 mL. How many mL per dose?
A. 10 mL
B. 5 mL
C. 2.5 mL
, D. 20 mL
A. 10 mL
Rationale: Use proportion: Desired (500 mg) / Have (250 mg) = mL / 5 mL. Step 1: 500/250
= 2. Step 2: 2 × 5 mL = 10 mL. Ensures safe administration.
Question 6: Percentages
What is 25% of 80?
A. 20
B. 25
C. 15
D. 30
A. 20
Rationale: 25% = 0.25. Step 1: 0.25 × 80 = 20. Percentages calculate discounts or solution
strengths.
Question 7: Unit Conversions (Household)
Convert 3 teaspoons to tablespoons.
A. 1 tbsp
B. 9 tbsp
C. 1.5 tbsp
D. 6 tbsp
A. 1 tbsp
Rationale: 1 tbsp = 3 tsp. Step 1: 3 tsp ÷ 3 = 1 tbsp. Household units aid patient education.
Question 8: Ratios
Dosage ratio: 1:100 insulin. How many units in 1 mL?
A. 100 units
Full Q&A with Step-by-Step
Rationales
Question 1: Unit Conversions (Metric)
Convert 2.5 liters to milliliters.
A. 250 mL
B. 2,500 mL
C. 25 mL
D. 250,000 mL
B. 2,500 mL
Rationale: To convert liters to milliliters, multiply by 1,000 (since 1 L = 1,000 mL). Step 1:
2.5 × 1,000 = 2,500. Thus, 2.5 L = 2,500 mL. This is critical for IV fluid administration in
nursing practice.
Question 2: Ratios
A nurse mixes 1 part saline to 3 parts dextrose. If 4 parts total 200 mL, what is the saline
volume?
A. 50 mL
B. 150 mL
C. 100 mL
D. 200 mL
A. 50 mL
Rationale: The ratio is 1:3, so saline is 1/4 of total. Step 1: Total parts = 4. Step 2: Saline
fraction = 1/4. Step 3: 1/4 × 200 mL = 50 mL. Ratios ensure accurate solution preparation.
,Question 3: Fractions
Add 1/2 + 1/3.
A. 2/5
B. 5/6
C. 1/6
D. 2/3
B. 5/6
Rationale: Common denominator is 6. Step 1: 1/2 = 3/6. Step 2: 1/3 = 2/6. Step 3: 3/6 + 2/6 =
5/6. Fractions are used in dividing medications or time.
Question 4: Word Problem
A patient needs 1,200 calories daily. If breakfast is 1/3 of total, how many calories for
breakfast?
A. 400 calories
B. 300 calories
C. 600 calories
D. 200 calories
A. 400 calories
Rationale: Breakfast = 1/3 of 1,200. Step 1: 1/3 × 1,200 = 400. This applies to nutritional
planning in patient care.
Question 5: Dosage Calculation
Order: 500 mg antibiotic q6h. Available: 250 mg/5 mL. How many mL per dose?
A. 10 mL
B. 5 mL
C. 2.5 mL
, D. 20 mL
A. 10 mL
Rationale: Use proportion: Desired (500 mg) / Have (250 mg) = mL / 5 mL. Step 1: 500/250
= 2. Step 2: 2 × 5 mL = 10 mL. Ensures safe administration.
Question 6: Percentages
What is 25% of 80?
A. 20
B. 25
C. 15
D. 30
A. 20
Rationale: 25% = 0.25. Step 1: 0.25 × 80 = 20. Percentages calculate discounts or solution
strengths.
Question 7: Unit Conversions (Household)
Convert 3 teaspoons to tablespoons.
A. 1 tbsp
B. 9 tbsp
C. 1.5 tbsp
D. 6 tbsp
A. 1 tbsp
Rationale: 1 tbsp = 3 tsp. Step 1: 3 tsp ÷ 3 = 1 tbsp. Household units aid patient education.
Question 8: Ratios
Dosage ratio: 1:100 insulin. How many units in 1 mL?
A. 100 units
