NUR 242 Dosage Calculation Practice
Exam 1 with KEY | Questions with 100%
Correct Answers | Verified | Updated
2026
Question 1
A provider prescribes amoxicillin 500 mg PO every 8 hours. The available
tablets are 250 mg. How many tablets should the nurse administer per
dose?
A) 1 tablet
B) 2 tablets
C) 3 tablets
D) 4 tablets
Correct ,,,,answer,,,: B
Rationale: The prescribed dose is 500 mg and each tablet contains 250
mg. Using the formula Desired dose ÷ Dose on hand = 500 mg ÷ 250 mg =
2 tablets. Always match the ordered dose with the available strength and
follow safe rounding rules .
Question 2
,A nurse is to administer 1,000 mL of IV fluid over 8 hours. What is the
infusion rate in mL/hr?
A) 100 mL/hr
B) 125 mL/hr
C) 150 mL/hr
D) 175 mL/hr
Correct ,,,,answer,,,: B
Rationale: To find the hourly rate, divide the total volume by the total time
in hours: 1000 mL ÷ 8 hours = 125 mL/hr. Accurate IV pump settings are
crucial to prevent fluid overload or dehydration .
Question 3
A medication order reads 0.5 g. How many mg should the nurse
administer?
A) 50 mg
B) 100 mg
C) 500 mg
D) 1000 mg
Correct ,,,,answer,,,: C
Rationale: Convert grams to milligrams. Since 1 g = 1000 mg, multiply:
0.5 g × 1000 = 500 mg. Always convert to the same unit before
calculating .
,Question 4
A nurse must give heparin 5,000 units subcutaneously. The vial reads
10,000 units/mL. How many mL will the nurse administer?
A) 0.25 mL
B) 0.5 mL
C) 1 mL
D) 2 mL
Correct ,,,,answer,,,: B
Rationale: Dose ÷ concentration = 5000 units ÷ 10000 units/mL = 0.5 mL.
Heparin is a high-alert medication requiring precise calculation to avoid
bleeding risk .
Question 5
The order is to infuse 125 mL/hr. The drop factor is 10 gtt/mL. How many
gtt/min will infuse? Round to the nearest whole number.
A) 18 gtt/min
B) 20 gtt/min
C) 21 gtt/min
D) 25 gtt/min
Correct ,,,,answer,,,: C
Rationale: Formula: (mL/hr × drop factor) ÷ 60 min = (125 × 10) ÷ 60 =
1250 ÷ 60 = 20.8 = 21 gtt/min. You cannot have an accurate half of a drop,
so round to the nearest whole number .
, Question 6
The MD orders 1000 mL of D5W to be given over 6 hours. The tubing has a
drop factor of 10 gtt/mL. Calculate the flow rate in gtt/min. Round to the
nearest whole number.
A) 25 gtt/min
B) 28 gtt/min
C) 30 gtt/min
D) 33 gtt/min
Correct ,,,,answer,,,: B
Rationale: Total volume ÷ time in hours = mL/hr: 1000 mL ÷ 6 hr = 166.67
mL/hr. Then (mL/hr × drop factor) ÷ 60 = (166.67 × 10) ÷ 60 = 1666.7 ÷ 60
= 27.78 = 28 gtt/min .
Question 7
A medication order reads 0.25 mg. How many mcg should the nurse
administer?
A) 25 mcg
B) 250 mcg
C) 2.5 mcg
D) 2500 mcg
Correct ,,,,answer,,,: B
Exam 1 with KEY | Questions with 100%
Correct Answers | Verified | Updated
2026
Question 1
A provider prescribes amoxicillin 500 mg PO every 8 hours. The available
tablets are 250 mg. How many tablets should the nurse administer per
dose?
A) 1 tablet
B) 2 tablets
C) 3 tablets
D) 4 tablets
Correct ,,,,answer,,,: B
Rationale: The prescribed dose is 500 mg and each tablet contains 250
mg. Using the formula Desired dose ÷ Dose on hand = 500 mg ÷ 250 mg =
2 tablets. Always match the ordered dose with the available strength and
follow safe rounding rules .
Question 2
,A nurse is to administer 1,000 mL of IV fluid over 8 hours. What is the
infusion rate in mL/hr?
A) 100 mL/hr
B) 125 mL/hr
C) 150 mL/hr
D) 175 mL/hr
Correct ,,,,answer,,,: B
Rationale: To find the hourly rate, divide the total volume by the total time
in hours: 1000 mL ÷ 8 hours = 125 mL/hr. Accurate IV pump settings are
crucial to prevent fluid overload or dehydration .
Question 3
A medication order reads 0.5 g. How many mg should the nurse
administer?
A) 50 mg
B) 100 mg
C) 500 mg
D) 1000 mg
Correct ,,,,answer,,,: C
Rationale: Convert grams to milligrams. Since 1 g = 1000 mg, multiply:
0.5 g × 1000 = 500 mg. Always convert to the same unit before
calculating .
,Question 4
A nurse must give heparin 5,000 units subcutaneously. The vial reads
10,000 units/mL. How many mL will the nurse administer?
A) 0.25 mL
B) 0.5 mL
C) 1 mL
D) 2 mL
Correct ,,,,answer,,,: B
Rationale: Dose ÷ concentration = 5000 units ÷ 10000 units/mL = 0.5 mL.
Heparin is a high-alert medication requiring precise calculation to avoid
bleeding risk .
Question 5
The order is to infuse 125 mL/hr. The drop factor is 10 gtt/mL. How many
gtt/min will infuse? Round to the nearest whole number.
A) 18 gtt/min
B) 20 gtt/min
C) 21 gtt/min
D) 25 gtt/min
Correct ,,,,answer,,,: C
Rationale: Formula: (mL/hr × drop factor) ÷ 60 min = (125 × 10) ÷ 60 =
1250 ÷ 60 = 20.8 = 21 gtt/min. You cannot have an accurate half of a drop,
so round to the nearest whole number .
, Question 6
The MD orders 1000 mL of D5W to be given over 6 hours. The tubing has a
drop factor of 10 gtt/mL. Calculate the flow rate in gtt/min. Round to the
nearest whole number.
A) 25 gtt/min
B) 28 gtt/min
C) 30 gtt/min
D) 33 gtt/min
Correct ,,,,answer,,,: B
Rationale: Total volume ÷ time in hours = mL/hr: 1000 mL ÷ 6 hr = 166.67
mL/hr. Then (mL/hr × drop factor) ÷ 60 = (166.67 × 10) ÷ 60 = 1666.7 ÷ 60
= 27.78 = 28 gtt/min .
Question 7
A medication order reads 0.25 mg. How many mcg should the nurse
administer?
A) 25 mcg
B) 250 mcg
C) 2.5 mcg
D) 2500 mcg
Correct ,,,,answer,,,: B
