NMC CBT NMC-CBT Drug Calculations and Numeracy 2

Question 1

A patient requires 750 micrograms of digoxin. Tablets available are 250 micrograms each. How many tablets should be administered?

Accepted Answer

3 tablets

Answer

750 ÷ 250 = 3 tablets.

Question 2

An IV infusion of 500 mL must run over 4 hours using a standard giving set (20 drops/mL). What is the drip rate in drops per minute?

Accepted Answer

42 drops/min

Answer

(500 × 20) ÷ (4 × 60) = 10000 ÷ 240 ≈ 41.7, rounded to 42 drops/min.

Question 3

A child weighing 20 kg requires amoxicillin at 25 mg/kg/day in 3 divided doses. What is the dose per administration?

Accepted Answer

167 mg

Answer

(20 × 25) ÷ 3 = 500 ÷ 3 ≈ 166.7 mg, rounded to 167 mg.

Question 4

Heparin 25,000 units is added to 250 mL of 0.9% saline. The infusion runs at 20 mL/hour. How many units per hour does the patient receive?

Accepted Answer

2,000 units/hr

Answer

Concentration = 25,000 ÷ 250 = 100 units/mL; 100 × 20 = 2,000 units/hr.

Question 5

A patient is prescribed morphine 15 mg orally. The syrup available is 10 mg/5 mL. How many mL should be given?

Accepted Answer

7.5 mL

Answer

(15 ÷ 10) × 5 = 7.5 mL using the formula: required ÷ stock × volume.

(NMC CBT) Nursing and Midwifery Council Computer-Based Test Practice Test