Spring 2026 Pediatric Dosage Calculations
Nursing Math Prep | NCLEX‑Style Ultimate
Bundle | Verified Rationales & Tips
100 Questions
1. A child weighing 22 kg is prescribed amoxicillin 50 mg/kg/day in divided doses every 8 hours. What is
the dose per administration?
A) 367 mg
B) 733 mg
C) 1100 mg
D) 550 mg
🎯CORRECT CHOICE: A) 367 mg
💡EXPLANATION: Total daily dose = 22 kg × 50 mg/kg = 1100 mg/day. Every 8 hours = 3 doses/day. Dose
per administration = 1100 mg / 3 = 366.67 ≈ 367 mg.
2. A pediatric patient weighs 16 kg. The provider orders ceftriaxone 50 mg/kg IV once daily. How many
mg will the nurse administer?
A) 800 mg
B) 600 mg
C) 1000 mg
D) 400 mg
🎯CORRECT CHOICE: A) 800 mg
💡EXPLANATION: 16 kg × 50 mg/kg = 800 mg per dose. Ceftriaxone is ordered once daily, so the total
daily dose is administered in one dose.
3. A child weighs 30 pounds. How many kilograms does this child weigh? (Round to nearest tenth)
,A) 13.6 kg
B) 14.0 kg
C) 12.5 kg
D) 15.0 kg
🎯CORRECT CHOICE: A) 13.6 kg
💡EXPLANATION: 1 kg = 2.2 lb. 30 lb / 2.2 = 13.636 ≈ 13.6 kg. Accurate weight conversion is essential for
safe pediatric dosing.
4. A nurse is calculating the safe dose range for a medication. The therapeutic range is 10-20 mg/kg/day
in divided doses every 6 hours. The child weighs 18 kg. What is the maximum safe dose per
administration?
A) 180 mg
B) 90 mg
C) 360 mg
D) 45 mg
🎯CORRECT CHOICE: B) 90 mg
💡EXPLANATION: Maximum daily dose = 20 mg/kg × 18 kg = 360 mg/day. Every 6 hours = 4 doses/day.
Maximum per dose = 360 mg / 4 = 90 mg.
5. A child is prescribed 250 mg of a medication. The available concentration is 125 mg/5 mL. How many
mL will the nurse administer?
A) 2 mL
B) 5 mL
C) 10 mL
D) 15 mL
🎯CORRECT CHOICE: C) 10 mL
,💡EXPLANATION: Desired dose = 250 mg. Concentration = 125 mg/5 mL. 250 mg / 125 mg = 2. 2 × 5 mL =
10 mL.
6. An infant weighs 8 kg. The order is for acetaminophen 15 mg/kg/dose every 6 hours PRN for fever.
What is the single dose in mg?
A) 80 mg
B) 100 mg
C) 120 mg
D) 160 mg
🎯CORRECT CHOICE: C) 120 mg
💡EXPLANATION: 8 kg × 15 mg/kg = 120 mg per dose. This is the single dose to be administered every 6
hours as needed.
7. A pediatric patient is to receive IV fluids at 4 mL/kg/hr. The child weighs 42 kg. What is the hourly
infusion rate in mL/hr?
A) 168 mL/hr
B) 84 mL/hr
C) 210 mL/hr
D) 126 mL/hr
🎯CORRECT CHOICE: A) 168 mL/hr
💡EXPLANATION: 42 kg × 4 mL/kg/hr = 168 mL/hr. This is the maintenance fluid rate for this patient.
8. A nurse needs to administer 300 mg of a liquid medication. The label reads 100 mg/2 mL. How many
mL will the nurse give?
A) 3 mL
B) 6 mL
C) 4 mL
D) 8 mL
, 🎯CORRECT CHOICE: B) 6 mL
💡EXPLANATION: Desired dose = 300 mg. Concentration = 100 mg/2 mL = 50 mg/mL. 300 mg / 50
mg/mL = 6 mL.
9. A child weighing 55 lb is prescribed a medication at 2 mg/kg/dose. What is the dose in mg?
A) 50 mg
B) 100 mg
C) 25 mg
D) 75 mg
🎯CORRECT CHOICE: A) 50 mg
💡EXPLANATION: 55 lb / 2.2 = 25 kg. 25 kg × 2 mg/kg = 50 mg. Always convert pounds to kilograms first.
10. A patient is ordered cefdinir 14 mg/kg/day in two divided doses. The child weighs 30 kg. What is
each dose?
A) 210 mg
B) 420 mg
C) 105 mg
D) 315 mg
🎯CORRECT CHOICE: A) 210 mg
💡EXPLANATION: Total daily dose = 30 kg × 14 mg/kg = 420 mg/day. Divided into two doses = 420 mg / 2
= 210 mg per dose.
11. The IV infusion rate for a pediatric patient is 50 mL/hr. The IV set delivers 20 drops/mL. What is the
drip rate in drops/min? (Round to nearest whole drop)
A) 17 gtt/min
B) 25 gtt/min
C) 33 gtt/min
Nursing Math Prep | NCLEX‑Style Ultimate
Bundle | Verified Rationales & Tips
100 Questions
1. A child weighing 22 kg is prescribed amoxicillin 50 mg/kg/day in divided doses every 8 hours. What is
the dose per administration?
A) 367 mg
B) 733 mg
C) 1100 mg
D) 550 mg
🎯CORRECT CHOICE: A) 367 mg
💡EXPLANATION: Total daily dose = 22 kg × 50 mg/kg = 1100 mg/day. Every 8 hours = 3 doses/day. Dose
per administration = 1100 mg / 3 = 366.67 ≈ 367 mg.
2. A pediatric patient weighs 16 kg. The provider orders ceftriaxone 50 mg/kg IV once daily. How many
mg will the nurse administer?
A) 800 mg
B) 600 mg
C) 1000 mg
D) 400 mg
🎯CORRECT CHOICE: A) 800 mg
💡EXPLANATION: 16 kg × 50 mg/kg = 800 mg per dose. Ceftriaxone is ordered once daily, so the total
daily dose is administered in one dose.
3. A child weighs 30 pounds. How many kilograms does this child weigh? (Round to nearest tenth)
,A) 13.6 kg
B) 14.0 kg
C) 12.5 kg
D) 15.0 kg
🎯CORRECT CHOICE: A) 13.6 kg
💡EXPLANATION: 1 kg = 2.2 lb. 30 lb / 2.2 = 13.636 ≈ 13.6 kg. Accurate weight conversion is essential for
safe pediatric dosing.
4. A nurse is calculating the safe dose range for a medication. The therapeutic range is 10-20 mg/kg/day
in divided doses every 6 hours. The child weighs 18 kg. What is the maximum safe dose per
administration?
A) 180 mg
B) 90 mg
C) 360 mg
D) 45 mg
🎯CORRECT CHOICE: B) 90 mg
💡EXPLANATION: Maximum daily dose = 20 mg/kg × 18 kg = 360 mg/day. Every 6 hours = 4 doses/day.
Maximum per dose = 360 mg / 4 = 90 mg.
5. A child is prescribed 250 mg of a medication. The available concentration is 125 mg/5 mL. How many
mL will the nurse administer?
A) 2 mL
B) 5 mL
C) 10 mL
D) 15 mL
🎯CORRECT CHOICE: C) 10 mL
,💡EXPLANATION: Desired dose = 250 mg. Concentration = 125 mg/5 mL. 250 mg / 125 mg = 2. 2 × 5 mL =
10 mL.
6. An infant weighs 8 kg. The order is for acetaminophen 15 mg/kg/dose every 6 hours PRN for fever.
What is the single dose in mg?
A) 80 mg
B) 100 mg
C) 120 mg
D) 160 mg
🎯CORRECT CHOICE: C) 120 mg
💡EXPLANATION: 8 kg × 15 mg/kg = 120 mg per dose. This is the single dose to be administered every 6
hours as needed.
7. A pediatric patient is to receive IV fluids at 4 mL/kg/hr. The child weighs 42 kg. What is the hourly
infusion rate in mL/hr?
A) 168 mL/hr
B) 84 mL/hr
C) 210 mL/hr
D) 126 mL/hr
🎯CORRECT CHOICE: A) 168 mL/hr
💡EXPLANATION: 42 kg × 4 mL/kg/hr = 168 mL/hr. This is the maintenance fluid rate for this patient.
8. A nurse needs to administer 300 mg of a liquid medication. The label reads 100 mg/2 mL. How many
mL will the nurse give?
A) 3 mL
B) 6 mL
C) 4 mL
D) 8 mL
, 🎯CORRECT CHOICE: B) 6 mL
💡EXPLANATION: Desired dose = 300 mg. Concentration = 100 mg/2 mL = 50 mg/mL. 300 mg / 50
mg/mL = 6 mL.
9. A child weighing 55 lb is prescribed a medication at 2 mg/kg/dose. What is the dose in mg?
A) 50 mg
B) 100 mg
C) 25 mg
D) 75 mg
🎯CORRECT CHOICE: A) 50 mg
💡EXPLANATION: 55 lb / 2.2 = 25 kg. 25 kg × 2 mg/kg = 50 mg. Always convert pounds to kilograms first.
10. A patient is ordered cefdinir 14 mg/kg/day in two divided doses. The child weighs 30 kg. What is
each dose?
A) 210 mg
B) 420 mg
C) 105 mg
D) 315 mg
🎯CORRECT CHOICE: A) 210 mg
💡EXPLANATION: Total daily dose = 30 kg × 14 mg/kg = 420 mg/day. Divided into two doses = 420 mg / 2
= 210 mg per dose.
11. The IV infusion rate for a pediatric patient is 50 mL/hr. The IV set delivers 20 drops/mL. What is the
drip rate in drops/min? (Round to nearest whole drop)
A) 17 gtt/min
B) 25 gtt/min
C) 33 gtt/min
