### Spring 2026 Pediatric Dosage
Calculations Nursing Math Prep | NCLEX-
Style Ultimate Bundle | Verified Rationales
& Tips
**100 Questions with Verified
Rationales**
---
**1. A nurse is preparing to administer amoxicillin 250 mg PO to a child. The medication is available as a
liquid suspension with a concentration of 125 mg/5 mL. How many mL should the nurse administer?**
A) 5 mL
B) 10 mL
C) 15 mL
D) 20 mL
🎯CORRECT CHOICE: B
💡EXPLANATION: Use the formula: Desired / Available × Quantity = 250 mg / 125 mg × 5 mL = 2 × 5 mL =
10 mL.
**2. A child weighing 22 kg is prescribed acetaminophen 15 mg/kg/dose. The medication is available as
160 mg/5 mL. How many mL should the nurse administer per dose?**
A) 8.5 mL
B) 10.3 mL
C) 12.5 mL
,D) 15.2 mL
🎯CORRECT CHOICE: B
💡EXPLANATION: Calculate dose: 22 kg × 15 mg/kg = 330 mg. Then calculate volume: 330 mg / 160 mg ×
5 mL = 2.0625 × 5 mL = 10.3 mL.
**3. A preschooler weighing 16 kg is prescribed ibuprofen 10 mg/kg/dose. The available concentration is
100 mg/5 mL. How many mL should the nurse administer?**
A) 6 mL
B) 8 mL
C) 10 mL
D) 12 mL
🎯CORRECT CHOICE: B
💡EXPLANATION: Calculate dose: 16 kg × 10 mg/kg = 160 mg. Then: 160 mg / 100 mg × 5 mL = 1.6 × 5 = 8
mL.
**4. A pediatric patient is prescribed cefdinir 7 mg/kg/dose twice daily. The child weighs 40 lb. How
many mg should the nurse administer per dose?**
A) 84 mg
B) 105 mg
C) 127 mg
D) 140 mg
🎯CORRECT CHOICE: C
💡EXPLANATION: Convert weight: 40 lb ÷ 2.2 = 18.18 kg. Dose = 18.18 kg × 7 mg/kg = 127.27 mg,
rounded to 127 mg.
**5. A nurse needs to administer 0.9% normal saline at 100 mL/hr to a child. The infusion set delivers 60
drops/mL. What is the drip rate in drops per minute?**
A) 50 gtt/min
B) 75 gtt/min
C) 100 gtt/min
,D) 125 gtt/min
🎯CORRECT CHOICE: C
💡EXPLANATION: Formula: (Volume × Drop Factor) / Time in minutes = (100 mL × 60 gtt/mL) / 60 min =
= 100 gtt/min.
**6. A child weighing 34 kg is prescribed vancomycin 40 mg/kg/day divided into 4 doses. How many mg
should the nurse administer per dose?**
A) 340 mg
B) 360 mg
C) 400 mg
D) 420 mg
🎯CORRECT CHOICE: A
💡EXPLANATION: Calculate total daily dose: 34 kg × 40 mg/kg = 1360 mg/day. Divide by 4 doses: 1360
mg ÷ 4 = 340 mg/dose.
**7. A nurse is preparing an IV infusion of ampicillin 500 mg in 50 mL of D5W to be infused over 30
minutes. The drop factor is 20 gtt/mL. What is the drip rate?**
A) 33 gtt/min
B) 25 gtt/min
C) 50 gtt/min
D) 40 gtt/min
🎯CORRECT CHOICE: A
💡EXPLANATION: Formula: (50 mL × 20 gtt/mL) / 30 min = = 33.33 gtt/min.
**8. A child is prescribed digoxin 10 mcg/kg/day in two divided doses. The child weighs 15 kg. The
available concentration is 0.05 mg/mL. How many mL should the nurse administer per dose?**
A) 1.5 mL
B) 2.0 mL
C) 3.0 mL
D) 4.0 mL
, 🎯CORRECT CHOICE: A
💡EXPLANATION: Calculate daily dose: 15 kg × 10 mcg/kg = 150 mcg = 0.15 mg. Per dose = 0.15 mg ÷ 2 =
0.075 mg. Volume = 0.075 mg / 0.05 mg/mL = 1.5 mL.
**9. A nurse is to administer phenytoin 6 mg/kg/day in three divided doses to a child weighing 66 lb.
How many mg should the nurse administer per dose?**
A) 40 mg
B) 50 mg
C) 60 mg
D) 70 mg
🎯CORRECT CHOICE: C
💡EXPLANATION: Convert weight: 66 lb ÷ 2.2 = 30 kg. Daily dose = 30 kg × 6 mg/kg = 180 mg/day. Per
dose = 180 ÷ 3 = 60 mg.
**10. A child is prescribed furosemide 2 mg/kg/dose IV. The child weighs 28 kg. The medication is
available as 10 mg/mL. How many mL should the nurse administer?**
A) 4.6 mL
B) 5.0 mL
C) 5.6 mL
D) 6.0 mL
🎯CORRECT CHOICE: C
💡EXPLANATION: Calculate dose: 28 kg × 2 mg/kg = 56 mg. Volume = 56 mg / 10 mg/mL = 5.6 mL.
**11. A pediatric patient is prescribed acyclovir 20 mg/kg/dose IV every 8 hours. The child weighs 12 kg.
The concentration is 50 mg/mL. How many mL should the nurse administer per dose?**
A) 4.0 mL
B) 4.8 mL
C) 5.2 mL
D) 6.0 mL
🎯CORRECT CHOICE: B
Calculations Nursing Math Prep | NCLEX-
Style Ultimate Bundle | Verified Rationales
& Tips
**100 Questions with Verified
Rationales**
---
**1. A nurse is preparing to administer amoxicillin 250 mg PO to a child. The medication is available as a
liquid suspension with a concentration of 125 mg/5 mL. How many mL should the nurse administer?**
A) 5 mL
B) 10 mL
C) 15 mL
D) 20 mL
🎯CORRECT CHOICE: B
💡EXPLANATION: Use the formula: Desired / Available × Quantity = 250 mg / 125 mg × 5 mL = 2 × 5 mL =
10 mL.
**2. A child weighing 22 kg is prescribed acetaminophen 15 mg/kg/dose. The medication is available as
160 mg/5 mL. How many mL should the nurse administer per dose?**
A) 8.5 mL
B) 10.3 mL
C) 12.5 mL
,D) 15.2 mL
🎯CORRECT CHOICE: B
💡EXPLANATION: Calculate dose: 22 kg × 15 mg/kg = 330 mg. Then calculate volume: 330 mg / 160 mg ×
5 mL = 2.0625 × 5 mL = 10.3 mL.
**3. A preschooler weighing 16 kg is prescribed ibuprofen 10 mg/kg/dose. The available concentration is
100 mg/5 mL. How many mL should the nurse administer?**
A) 6 mL
B) 8 mL
C) 10 mL
D) 12 mL
🎯CORRECT CHOICE: B
💡EXPLANATION: Calculate dose: 16 kg × 10 mg/kg = 160 mg. Then: 160 mg / 100 mg × 5 mL = 1.6 × 5 = 8
mL.
**4. A pediatric patient is prescribed cefdinir 7 mg/kg/dose twice daily. The child weighs 40 lb. How
many mg should the nurse administer per dose?**
A) 84 mg
B) 105 mg
C) 127 mg
D) 140 mg
🎯CORRECT CHOICE: C
💡EXPLANATION: Convert weight: 40 lb ÷ 2.2 = 18.18 kg. Dose = 18.18 kg × 7 mg/kg = 127.27 mg,
rounded to 127 mg.
**5. A nurse needs to administer 0.9% normal saline at 100 mL/hr to a child. The infusion set delivers 60
drops/mL. What is the drip rate in drops per minute?**
A) 50 gtt/min
B) 75 gtt/min
C) 100 gtt/min
,D) 125 gtt/min
🎯CORRECT CHOICE: C
💡EXPLANATION: Formula: (Volume × Drop Factor) / Time in minutes = (100 mL × 60 gtt/mL) / 60 min =
= 100 gtt/min.
**6. A child weighing 34 kg is prescribed vancomycin 40 mg/kg/day divided into 4 doses. How many mg
should the nurse administer per dose?**
A) 340 mg
B) 360 mg
C) 400 mg
D) 420 mg
🎯CORRECT CHOICE: A
💡EXPLANATION: Calculate total daily dose: 34 kg × 40 mg/kg = 1360 mg/day. Divide by 4 doses: 1360
mg ÷ 4 = 340 mg/dose.
**7. A nurse is preparing an IV infusion of ampicillin 500 mg in 50 mL of D5W to be infused over 30
minutes. The drop factor is 20 gtt/mL. What is the drip rate?**
A) 33 gtt/min
B) 25 gtt/min
C) 50 gtt/min
D) 40 gtt/min
🎯CORRECT CHOICE: A
💡EXPLANATION: Formula: (50 mL × 20 gtt/mL) / 30 min = = 33.33 gtt/min.
**8. A child is prescribed digoxin 10 mcg/kg/day in two divided doses. The child weighs 15 kg. The
available concentration is 0.05 mg/mL. How many mL should the nurse administer per dose?**
A) 1.5 mL
B) 2.0 mL
C) 3.0 mL
D) 4.0 mL
, 🎯CORRECT CHOICE: A
💡EXPLANATION: Calculate daily dose: 15 kg × 10 mcg/kg = 150 mcg = 0.15 mg. Per dose = 0.15 mg ÷ 2 =
0.075 mg. Volume = 0.075 mg / 0.05 mg/mL = 1.5 mL.
**9. A nurse is to administer phenytoin 6 mg/kg/day in three divided doses to a child weighing 66 lb.
How many mg should the nurse administer per dose?**
A) 40 mg
B) 50 mg
C) 60 mg
D) 70 mg
🎯CORRECT CHOICE: C
💡EXPLANATION: Convert weight: 66 lb ÷ 2.2 = 30 kg. Daily dose = 30 kg × 6 mg/kg = 180 mg/day. Per
dose = 180 ÷ 3 = 60 mg.
**10. A child is prescribed furosemide 2 mg/kg/dose IV. The child weighs 28 kg. The medication is
available as 10 mg/mL. How many mL should the nurse administer?**
A) 4.6 mL
B) 5.0 mL
C) 5.6 mL
D) 6.0 mL
🎯CORRECT CHOICE: C
💡EXPLANATION: Calculate dose: 28 kg × 2 mg/kg = 56 mg. Volume = 56 mg / 10 mg/mL = 5.6 mL.
**11. A pediatric patient is prescribed acyclovir 20 mg/kg/dose IV every 8 hours. The child weighs 12 kg.
The concentration is 50 mg/mL. How many mL should the nurse administer per dose?**
A) 4.0 mL
B) 4.8 mL
C) 5.2 mL
D) 6.0 mL
🎯CORRECT CHOICE: B
