NR226 Dosage Calculations Mastery 2026 |
200+ Med Math Practice Questions with
Step
1. A patient is prescribed 500 mg of liquid medication. The available concentration is 250
mg/5 mL. How many mL should the nurse administer?
a) 5 mL
b) 10 mL
c) 15 mL
d) 20 mL
Rationale: 500 mg ÷ 250 mg = 2 × 5 mL = 10 mL.
2. The order is amoxicillin 1 g PO. The pharmacy sends 500 mg capsules. How many
capsules should be given?
a) 1 capsule
b) 2 capsules
c) 3 capsules
d) 4 capsules
Rationale: 1 g = 1000 mg. 1000 ÷ 500 = 2 capsules.
3. A patient needs heparin 5,000 units subcutaneously. The vial reads 10,000 units/mL.
How many mL should the nurse draw up?
a) 0.25 mL
b) 0.5 mL
c) 0.75 mL
d) 1 mL
Rationale: 5,000 ÷ 10,000 = 0.5 mL.
4. The IV bag contains 40 mEq of potassium chloride in 1000 mL of D5W. The patient is to
receive 20 mEq. How many mL should be infused?
, a) 250 mL
b) 500 mL
c) 750 mL
d) 1000 mL
Rationale: 20/40 = 0.5 × 1000 mL = 500 mL.
5. An order reads: furosemide 40 mg IV push. The vial is labeled 10 mg/mL. How many mL
should the nurse administer?
a) 2 mL
b) 4 mL
c) 6 mL
d) 8 mL
Rationale: 40 mg ÷ 10 mg/mL = 4 mL.
6. A child weighs 66 lb. Convert weight to kg.
a) 20 kg
b) 30 kg
c) 40 kg
d) 50 kg
Rationale: 66 lb ÷ 2.2 = 30 kg.
7. The order is digoxin 0.125 mg PO. The tablet strength is 0.25 mg. How many tablets
should be given?
a) 0.25 tablet
b) 0.5 tablet
c) 1 tablet
d) 2 tablets
Rationale: 0.125 ÷ 0.25 = 0.5 tablet.
8. A patient is to receive 1000 mL of NS over 8 hours. The drop factor is 15 gtt/mL.
Calculate the flow rate in gtt/min.
, a) 24 gtt/min
b) 31 gtt/min
c) 42 gtt/min
d) 56 gtt/min
Rationale: 1000 mL ÷ 8 hr = 125 mL/hr. 125 × 15 ÷ 60 = 31.25 ≈ 31 gtt/min.
9. The order is metoprolol 25 mg PO daily. Available: 50 mg scored tablets. How many
tablets?
a) 0.25 tablet
b) 0.5 tablet
c) 1 tablet
d) 1.5 tablets
Rationale: 25 ÷ 50 = 0.5 tablet.
10. IV fluid is infusing at 42 gtt/min. The drop factor is 20 gtt/mL. How many mL/hr is the
patient receiving?
a) 84 mL/hr
b) 126 mL/hr
c) 160 mL/hr
d) 210 mL/hr
Rationale: 42 gtt/min ÷ 20 gtt/mL = 2.1 mL/min × 60 = 126 mL/hr.
11. A patient requires 2 L of oxygen via nasal cannula. How many mL/min is that?
a) 1000 mL/min
b) 2000 mL/min
c) 3000 mL/min
d) 4000 mL/min
Rationale: 2 L × 1000 = 2000 mL/min.
12. The order is cephalexin 250 mg PO. The suspension is 125 mg/5 mL. How many mL?
a) 5 mL
200+ Med Math Practice Questions with
Step
1. A patient is prescribed 500 mg of liquid medication. The available concentration is 250
mg/5 mL. How many mL should the nurse administer?
a) 5 mL
b) 10 mL
c) 15 mL
d) 20 mL
Rationale: 500 mg ÷ 250 mg = 2 × 5 mL = 10 mL.
2. The order is amoxicillin 1 g PO. The pharmacy sends 500 mg capsules. How many
capsules should be given?
a) 1 capsule
b) 2 capsules
c) 3 capsules
d) 4 capsules
Rationale: 1 g = 1000 mg. 1000 ÷ 500 = 2 capsules.
3. A patient needs heparin 5,000 units subcutaneously. The vial reads 10,000 units/mL.
How many mL should the nurse draw up?
a) 0.25 mL
b) 0.5 mL
c) 0.75 mL
d) 1 mL
Rationale: 5,000 ÷ 10,000 = 0.5 mL.
4. The IV bag contains 40 mEq of potassium chloride in 1000 mL of D5W. The patient is to
receive 20 mEq. How many mL should be infused?
, a) 250 mL
b) 500 mL
c) 750 mL
d) 1000 mL
Rationale: 20/40 = 0.5 × 1000 mL = 500 mL.
5. An order reads: furosemide 40 mg IV push. The vial is labeled 10 mg/mL. How many mL
should the nurse administer?
a) 2 mL
b) 4 mL
c) 6 mL
d) 8 mL
Rationale: 40 mg ÷ 10 mg/mL = 4 mL.
6. A child weighs 66 lb. Convert weight to kg.
a) 20 kg
b) 30 kg
c) 40 kg
d) 50 kg
Rationale: 66 lb ÷ 2.2 = 30 kg.
7. The order is digoxin 0.125 mg PO. The tablet strength is 0.25 mg. How many tablets
should be given?
a) 0.25 tablet
b) 0.5 tablet
c) 1 tablet
d) 2 tablets
Rationale: 0.125 ÷ 0.25 = 0.5 tablet.
8. A patient is to receive 1000 mL of NS over 8 hours. The drop factor is 15 gtt/mL.
Calculate the flow rate in gtt/min.
, a) 24 gtt/min
b) 31 gtt/min
c) 42 gtt/min
d) 56 gtt/min
Rationale: 1000 mL ÷ 8 hr = 125 mL/hr. 125 × 15 ÷ 60 = 31.25 ≈ 31 gtt/min.
9. The order is metoprolol 25 mg PO daily. Available: 50 mg scored tablets. How many
tablets?
a) 0.25 tablet
b) 0.5 tablet
c) 1 tablet
d) 1.5 tablets
Rationale: 25 ÷ 50 = 0.5 tablet.
10. IV fluid is infusing at 42 gtt/min. The drop factor is 20 gtt/mL. How many mL/hr is the
patient receiving?
a) 84 mL/hr
b) 126 mL/hr
c) 160 mL/hr
d) 210 mL/hr
Rationale: 42 gtt/min ÷ 20 gtt/mL = 2.1 mL/min × 60 = 126 mL/hr.
11. A patient requires 2 L of oxygen via nasal cannula. How many mL/min is that?
a) 1000 mL/min
b) 2000 mL/min
c) 3000 mL/min
d) 4000 mL/min
Rationale: 2 L × 1000 = 2000 mL/min.
12. The order is cephalexin 250 mg PO. The suspension is 125 mg/5 mL. How many mL?
a) 5 mL
