Relias RN Advanced Math Ability V2 | Q&A
with Rationale
1. A physician orders 0.5 grams of a medication to be given orally. The medication is available
in 250 mg tablets. How many tablets should the nurse administer?
A. 2 tablets
B. 1 tablet
C. 0.5 tablets
D. 3 tablets
Correct Answer: A
Rationale: To solve this, the nurse must first convert grams to milligrams by multiplying
0.5 g by 1,000, resulting in 500 mg. Then, divide the ordered dose of 500 mg by the
available dose of 250 mg per tablet. This calculation yields a result of 2 tablets, which is the
correct amount to administer safely.
2. An IV of 1,000 mL Normal Saline is ordered to infuse over 8 hours. What is the correct
infusion rate in mL/hr?
A. 100 mL/hr
B. 150 mL/hr
C. 125 mL/hr
,D. 80 mL/hr
Correct Answer: C
Rationale: The nurse calculates the hourly rate by dividing the total volume by the total
time in hours. Dividing 1,000 mL by 8 hours results in exactly 125 mL/hr. Precise
calculation of IV rates is critical to maintaining fluid balance and preventing circulatory
overload in the patient.
3. A patient is ordered to receive 2,500 units of Heparin subcutaneously. The vial contains
5,000 units/mL. How many mL will the nurse draw up?
A. 2 mL
B. 1 mL
C. 0.5 mL
D. 0.25 mL
Correct Answer: C
Rationale: The dosage formula (Desired / Have x Quantity) is used to find that 2,500 units
divided by 5,000 units/mL equals 0.5 mL. The nurse must carefully measure this volume in
a tuberculin or insulin syringe for accuracy. Correct measurement of high-alert medications
like Heparin is essential to avoid life-threatening bleeding complications.
4. A pediatric patient weighs 22 lbs. The physician orders a medication at 5 mg/kg. What is
the total dose in milligrams?
A. 50 mg
, B. 110 mg
C. 44 mg
D. 22 mg
Correct Answer: A
Rationale: First, the nurse must convert the weight from pounds to kilograms by dividing
22 lbs by 2.2, which equals 10 kg. Next, multiply the weight of 10 kg by the ordered 5
mg/kg to reach a total dose of 50 mg. Weight-based dosing is a fundamental competency in
pediatric nursing to ensure therapeutic efficacy without toxicity.
5. The nurse needs to administer 40 mg of Lasix IV push. The available concentration is 10
mg/mL. How many mL should be given?
A. 2 mL
B. 10 mL
C. 0.4 mL
D. 4 mL
Correct Answer: D
Rationale: Dividing the desired dose of 40 mg by the concentration of 10 mg/mL gives a
volume of 4 mL. The nurse should verify the concentration on the vial before drawing up
the medication. Administering the correct volume ensures the patient receives the
intended diuretic effect to manage fluid status.
with Rationale
1. A physician orders 0.5 grams of a medication to be given orally. The medication is available
in 250 mg tablets. How many tablets should the nurse administer?
A. 2 tablets
B. 1 tablet
C. 0.5 tablets
D. 3 tablets
Correct Answer: A
Rationale: To solve this, the nurse must first convert grams to milligrams by multiplying
0.5 g by 1,000, resulting in 500 mg. Then, divide the ordered dose of 500 mg by the
available dose of 250 mg per tablet. This calculation yields a result of 2 tablets, which is the
correct amount to administer safely.
2. An IV of 1,000 mL Normal Saline is ordered to infuse over 8 hours. What is the correct
infusion rate in mL/hr?
A. 100 mL/hr
B. 150 mL/hr
C. 125 mL/hr
,D. 80 mL/hr
Correct Answer: C
Rationale: The nurse calculates the hourly rate by dividing the total volume by the total
time in hours. Dividing 1,000 mL by 8 hours results in exactly 125 mL/hr. Precise
calculation of IV rates is critical to maintaining fluid balance and preventing circulatory
overload in the patient.
3. A patient is ordered to receive 2,500 units of Heparin subcutaneously. The vial contains
5,000 units/mL. How many mL will the nurse draw up?
A. 2 mL
B. 1 mL
C. 0.5 mL
D. 0.25 mL
Correct Answer: C
Rationale: The dosage formula (Desired / Have x Quantity) is used to find that 2,500 units
divided by 5,000 units/mL equals 0.5 mL. The nurse must carefully measure this volume in
a tuberculin or insulin syringe for accuracy. Correct measurement of high-alert medications
like Heparin is essential to avoid life-threatening bleeding complications.
4. A pediatric patient weighs 22 lbs. The physician orders a medication at 5 mg/kg. What is
the total dose in milligrams?
A. 50 mg
, B. 110 mg
C. 44 mg
D. 22 mg
Correct Answer: A
Rationale: First, the nurse must convert the weight from pounds to kilograms by dividing
22 lbs by 2.2, which equals 10 kg. Next, multiply the weight of 10 kg by the ordered 5
mg/kg to reach a total dose of 50 mg. Weight-based dosing is a fundamental competency in
pediatric nursing to ensure therapeutic efficacy without toxicity.
5. The nurse needs to administer 40 mg of Lasix IV push. The available concentration is 10
mg/mL. How many mL should be given?
A. 2 mL
B. 10 mL
C. 0.4 mL
D. 4 mL
Correct Answer: D
Rationale: Dividing the desired dose of 40 mg by the concentration of 10 mg/mL gives a
volume of 4 mL. The nurse should verify the concentration on the vial before drawing up
the medication. Administering the correct volume ensures the patient receives the
intended diuretic effect to manage fluid status.
