Dosage Calculation RN Nursing Care of Children Online
Practice Assessment 3.0
Pediatric Medication Math Review | 2025/2026
SECTION 1: WEIGHT-BASED CALCULATIONS (Questions 1–15)
Question 1 of 40
A nurse is caring for a child who weighs 44 lb. The provider orders amoxicillin 40 mg/kg/day divided
every 8 hours. How many mg should the child receive per dose?
• A. 120 mg
• B. 200 mg
• C. 267 mg
• D. 400 mg
Correct Answer: C – 267 mg
Rationale:
1. Convert weight to kg: 44 lb ÷ 2.2 = 20 kg
2. Daily dose: 40 mg/kg × 20 kg = 800 mg/day
3. Divide by 3 doses (every 8 hours): 800 mg ÷ 3 = 266.67 → 267 mg per dose
Question 2 of 40
A nurse is preparing to administer ceftriaxone 50 mg/kg IM to a child who weighs 66 lb. The available
vial contains 350 mg/mL. How many mL should the nurse administer? (Round to the nearest tenth)
• A. 2.1 mL
• B. 3.0 mL
• C. 3.5 mL
• D. 4.3 mL
Correct Answer: D – 4.3 mL
,Rationale:
1. Convert weight to kg: 66 lb ÷ 2.2 = 30 kg
2. Calculate dose: 50 mg/kg × 30 kg = 1,500 mg
3. Volume = 1,500 mg ÷ 350 mg/mL = 4.2857 → 4.3 mL
Question 3 of 40
A nurse is caring for a toddler who weighs 13.5 kg. The provider orders clindamycin 10 mg/kg IV every 8
hours. How many mg should the nurse administer per dose?
• A. 45 mg
• B. 90 mg
• C. 135 mg
• D. 180 mg
Correct Answer: C – 135 mg
Rationale:
10 mg/kg × 13.5 kg = 135 mg per dose
Question 4 of 40
A nurse is preparing to administer famotidine 0.5 mg/kg IV to a child who weighs 48 lb. The available vial
contains 10 mg/mL. How many mL should the nurse administer? (Round to the nearest hundredth)
• A. 0.55 mL
• B. 1.09 mL
• C. 1.50 mL
• D. 2.18 mL
Correct Answer: B – 1.09 mL
Rationale:
1. Convert weight: 48 lb ÷ 2.2 = 21.818 kg
2. Calculate dose: 0.5 mg/kg × 21.818 kg = 10.909 mg
3. Volume = 10.909 mg ÷ 10 mg/mL = 1.09 mL
Question 5 of 40
,A nurse is caring for an infant who weighs 12 lb 4 oz. The provider orders acyclovir 20 mg/kg IV every 8
hours. How many mg should the nurse administer per dose? (Round to the nearest whole number)
• A. 84 mg
• B. 96 mg
• C. 110 mg
• D. 125 mg
Correct Answer: C – 110 mg
Rationale:
1. Convert weight: 12 lb 4 oz = 12.25 lb
2. Convert to kg: 12.25 lb ÷ 2.2 = 5.568 kg
3. Calculate dose: 20 mg/kg × 5.568 kg = 111.36 → 110 mg
Question 6 of 40
A nurse is preparing to administer furosemide 1 mg/kg IV to a child who weighs 55 lb. The available vial
contains 10 mg/mL. How many mL should the nurse administer? (Round to the nearest tenth)
• A. 2.0 mL
• B. 2.5 mL
• C. 3.0 mL
• D. 3.5 mL
Correct Answer: B – 2.5 mL
Rationale:
1. Convert weight: 55 lb ÷ 2.2 = 25 kg
2. Calculate dose: 1 mg/kg × 25 kg = 25 mg
3. Volume = 25 mg ÷ 10 mg/mL = 2.5 mL
Question 7 of 40
A nurse is caring for a child who weighs 32 kg. The provider orders gentamicin 6 mg/kg/day divided
every 8 hours. How many mg should the nurse administer per dose?
• A. 48 mg
• B. 64 mg
, • C. 72 mg
• D. 96 mg
Correct Answer: B – 64 mg
Rationale:
1. Daily dose: 6 mg/kg × 32 kg = 192 mg/day
2. Divide by 3 doses: 192 mg ÷ 3 = 64 mg per dose
Question 8 of 40
A nurse is preparing to administer ibuprofen 10 mg/kg PO to a child who weighs 88 lb. The available
suspension contains 100 mg/5 mL. How many mL should the nurse administer? (Round to the nearest
whole number)
• A. 10 mL
• B. 15 mL
• C. 20 mL
• D. 25 mL
Correct Answer: C – 20 mL
Rationale:
1. Convert weight: 88 lb ÷ 2.2 = 40 kg
2. Calculate dose: 10 mg/kg × 40 kg = 400 mg
3. Volume = (400 mg ÷ 100 mg) × 5 mL = 4 × 5 = 20 mL
Question 9 of 40
A nurse is caring for a child who weighs 27 kg. The provider orders methylprednisolone 2 mg/kg IV every
6 hours. How many mg should the nurse administer per dose?
• A. 27 mg
• B. 54 mg
• C. 81 mg
• D. 108 mg
Correct Answer: B – 54 mg
Practice Assessment 3.0
Pediatric Medication Math Review | 2025/2026
SECTION 1: WEIGHT-BASED CALCULATIONS (Questions 1–15)
Question 1 of 40
A nurse is caring for a child who weighs 44 lb. The provider orders amoxicillin 40 mg/kg/day divided
every 8 hours. How many mg should the child receive per dose?
• A. 120 mg
• B. 200 mg
• C. 267 mg
• D. 400 mg
Correct Answer: C – 267 mg
Rationale:
1. Convert weight to kg: 44 lb ÷ 2.2 = 20 kg
2. Daily dose: 40 mg/kg × 20 kg = 800 mg/day
3. Divide by 3 doses (every 8 hours): 800 mg ÷ 3 = 266.67 → 267 mg per dose
Question 2 of 40
A nurse is preparing to administer ceftriaxone 50 mg/kg IM to a child who weighs 66 lb. The available
vial contains 350 mg/mL. How many mL should the nurse administer? (Round to the nearest tenth)
• A. 2.1 mL
• B. 3.0 mL
• C. 3.5 mL
• D. 4.3 mL
Correct Answer: D – 4.3 mL
,Rationale:
1. Convert weight to kg: 66 lb ÷ 2.2 = 30 kg
2. Calculate dose: 50 mg/kg × 30 kg = 1,500 mg
3. Volume = 1,500 mg ÷ 350 mg/mL = 4.2857 → 4.3 mL
Question 3 of 40
A nurse is caring for a toddler who weighs 13.5 kg. The provider orders clindamycin 10 mg/kg IV every 8
hours. How many mg should the nurse administer per dose?
• A. 45 mg
• B. 90 mg
• C. 135 mg
• D. 180 mg
Correct Answer: C – 135 mg
Rationale:
10 mg/kg × 13.5 kg = 135 mg per dose
Question 4 of 40
A nurse is preparing to administer famotidine 0.5 mg/kg IV to a child who weighs 48 lb. The available vial
contains 10 mg/mL. How many mL should the nurse administer? (Round to the nearest hundredth)
• A. 0.55 mL
• B. 1.09 mL
• C. 1.50 mL
• D. 2.18 mL
Correct Answer: B – 1.09 mL
Rationale:
1. Convert weight: 48 lb ÷ 2.2 = 21.818 kg
2. Calculate dose: 0.5 mg/kg × 21.818 kg = 10.909 mg
3. Volume = 10.909 mg ÷ 10 mg/mL = 1.09 mL
Question 5 of 40
,A nurse is caring for an infant who weighs 12 lb 4 oz. The provider orders acyclovir 20 mg/kg IV every 8
hours. How many mg should the nurse administer per dose? (Round to the nearest whole number)
• A. 84 mg
• B. 96 mg
• C. 110 mg
• D. 125 mg
Correct Answer: C – 110 mg
Rationale:
1. Convert weight: 12 lb 4 oz = 12.25 lb
2. Convert to kg: 12.25 lb ÷ 2.2 = 5.568 kg
3. Calculate dose: 20 mg/kg × 5.568 kg = 111.36 → 110 mg
Question 6 of 40
A nurse is preparing to administer furosemide 1 mg/kg IV to a child who weighs 55 lb. The available vial
contains 10 mg/mL. How many mL should the nurse administer? (Round to the nearest tenth)
• A. 2.0 mL
• B. 2.5 mL
• C. 3.0 mL
• D. 3.5 mL
Correct Answer: B – 2.5 mL
Rationale:
1. Convert weight: 55 lb ÷ 2.2 = 25 kg
2. Calculate dose: 1 mg/kg × 25 kg = 25 mg
3. Volume = 25 mg ÷ 10 mg/mL = 2.5 mL
Question 7 of 40
A nurse is caring for a child who weighs 32 kg. The provider orders gentamicin 6 mg/kg/day divided
every 8 hours. How many mg should the nurse administer per dose?
• A. 48 mg
• B. 64 mg
, • C. 72 mg
• D. 96 mg
Correct Answer: B – 64 mg
Rationale:
1. Daily dose: 6 mg/kg × 32 kg = 192 mg/day
2. Divide by 3 doses: 192 mg ÷ 3 = 64 mg per dose
Question 8 of 40
A nurse is preparing to administer ibuprofen 10 mg/kg PO to a child who weighs 88 lb. The available
suspension contains 100 mg/5 mL. How many mL should the nurse administer? (Round to the nearest
whole number)
• A. 10 mL
• B. 15 mL
• C. 20 mL
• D. 25 mL
Correct Answer: C – 20 mL
Rationale:
1. Convert weight: 88 lb ÷ 2.2 = 40 kg
2. Calculate dose: 10 mg/kg × 40 kg = 400 mg
3. Volume = (400 mg ÷ 100 mg) × 5 mL = 4 × 5 = 20 mL
Question 9 of 40
A nurse is caring for a child who weighs 27 kg. The provider orders methylprednisolone 2 mg/kg IV every
6 hours. How many mg should the nurse administer per dose?
• A. 27 mg
• B. 54 mg
• C. 81 mg
• D. 108 mg
Correct Answer: B – 54 mg
