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TI RN Dosage Calculation Practice Exam 2025/2026
A
Actual Medication Math Questions with Verified Answers &
Step-by-Step Rationales | Graded A+
tudent Name:_________________________
S
Date:_______________
Time Limit:45 minutes
Total Questions:30
Instructions
● his exam contains 30 dosage calculation questions using dimensional analysis.
T
● Read each question carefully, including medication orders and labels.
● Show your work for each calculation using dimensional analysis.
● Round answers as specified in each question.
● Time limit: 45 minutes.
● Calculators are permitted; no other resources allowed.
Oral Medications
1. A provider orders acetaminophen 650 mg PO every 6 hours. The pharmacy provides
acetaminophen 325 mg tablets. How many tablets should the nurse administer per dose?
650 mg ÷ 325 mg/tablet = 2 tablets🟨
🟨
Rationale: Divide the ordered dose by the strengthper tablet to calculate the number of tablets,
per dimensional analysis.
2. A patient is prescribed amoxicillin 500 mg PO every 8 hours. The pharmacy provides amoxicillin
250 mg/5 mL suspension. How many mL should the nurse administer per dose?
(500 mg × 5 mL) ÷ 250 mg = 10 mL🟨
🟨
Rationale: Use dimensional analysis: (ordered dose× volume per strength) ÷ strength = volume
to administer.
3. A provider orders ibuprofen 800 mg PO every 4 hours PRN. The pharmacy provides ibuprofen
400 mg tablets. How many tablets should the nurse administer per dose?
, 800 mg ÷ 400 mg/tablet = 2 tablets🟨
🟨
Rationale: Divide the ordered dose by the tabletstrength to determine the number of tablets.
4. A patient is prescribed prednisone 20 mg PO daily. The pharmacy provides prednisone 5 mg
tablets. How many tablets should the nurse administer per dose?
20 mg ÷ 5 mg/tablet = 4 tablets🟨
🟨
Rationale: Divide the ordered dose by the strengthper tablet to calculate the number of tablets.
5. A provider orders metformin 1,000 mg PO twice daily. The pharmacy provides metformin 500
mg tablets. How many tablets should the nurse administer per dose?
1,000 mg ÷ 500 mg/tablet = 2 tablets🟨
🟨
Rationale: Divide the ordered dose by the tabletstrength to determine the number of tablets.
6. A patient is prescribed cephalexin 250 mg PO every 6 hours. The pharmacy provides cephalexin
125 mg/5 mL suspension. How many mL should the nurse administer per dose?
(250 mg × 5 mL) ÷ 125 mg = 10 mL🟨
🟨
Rationale: Use dimensional analysis: (ordered dose× volume per strength) ÷ strength = volume
to administer.
7. A provider orders omeprazole 40 mg PO daily. The pharmacy provides omeprazole 20 mg
capsules. How many capsules should the nurse administer per dose?
40 mg ÷ 20 mg/capsule = 2 capsules🟨
🟨
Rationale: Divide the ordered dose by the capsulestrength to calculate the number of capsules.
8. A patient is prescribed digoxin 0.125 mg PO daily. The pharmacy provides digoxin 0.25 mg
tablets. How many tablets should the nurse administer per dose?
0.125 mg ÷ 0.25 mg/tablet = 0.5 tablets🟨
🟨
Rationale: Divide the ordered dose by the tabletstrength; 0.5 tablets require cutting the tablet in
half.
9. A provider orders levothyroxine 0.1 mg PO daily. The pharmacy provides levothyroxine 100 mcg
tablets. How many tablets should the nurse administer per dose?
0.1 mg × (1,000 mcg/1 mg) ÷ 100 mcg/tablet = 1 tablet🟨
🟨
Rationale: Convert mg to mcg (0.1 mg = 100 mcg),then divide by tablet strength to calculate
the number of tablets.
10.A patient is prescribed fluoxetine 20 mg PO daily. The pharmacy provides fluoxetine 10 mg/5 mL
solution. How many mL should the nurse administer per dose?
(20 mg × 5 mL) ÷ 10 mg = 10 mL🟨
🟨
Rationale: Use dimensional analysis: (ordered dose× volume per strength) ÷ strength = volume
to administer.
IV Drip Rates
11.A provider orders 1,000 mL of 0.9% NS to infuse over 8 hours. The IV tubing has a drop factor
of 10 gtt/mL. What is the drip rate in gtt/min? (Round to the nearest whole number.)
(1,000 mL × 10 gtt/mL) ÷ (8 hr × 60 min/hr) = 2,083.33 ÷ 480 = 21 gtt/min🟨
🟨
Rationale: Use dimensional analysis: (total volume× drop factor) ÷ total minutes = drip rate.
12.A patient is prescribed 500 mL of D5W to infuse over 4 hours. The IV tubing has a drop factor of
15 gtt/mL. What is the drip rate in gtt/min? (Round to the nearest whole number.)
TI RN Dosage Calculation Practice Exam 2025/2026
A
Actual Medication Math Questions with Verified Answers &
Step-by-Step Rationales | Graded A+
tudent Name:_________________________
S
Date:_______________
Time Limit:45 minutes
Total Questions:30
Instructions
● his exam contains 30 dosage calculation questions using dimensional analysis.
T
● Read each question carefully, including medication orders and labels.
● Show your work for each calculation using dimensional analysis.
● Round answers as specified in each question.
● Time limit: 45 minutes.
● Calculators are permitted; no other resources allowed.
Oral Medications
1. A provider orders acetaminophen 650 mg PO every 6 hours. The pharmacy provides
acetaminophen 325 mg tablets. How many tablets should the nurse administer per dose?
650 mg ÷ 325 mg/tablet = 2 tablets🟨
🟨
Rationale: Divide the ordered dose by the strengthper tablet to calculate the number of tablets,
per dimensional analysis.
2. A patient is prescribed amoxicillin 500 mg PO every 8 hours. The pharmacy provides amoxicillin
250 mg/5 mL suspension. How many mL should the nurse administer per dose?
(500 mg × 5 mL) ÷ 250 mg = 10 mL🟨
🟨
Rationale: Use dimensional analysis: (ordered dose× volume per strength) ÷ strength = volume
to administer.
3. A provider orders ibuprofen 800 mg PO every 4 hours PRN. The pharmacy provides ibuprofen
400 mg tablets. How many tablets should the nurse administer per dose?
, 800 mg ÷ 400 mg/tablet = 2 tablets🟨
🟨
Rationale: Divide the ordered dose by the tabletstrength to determine the number of tablets.
4. A patient is prescribed prednisone 20 mg PO daily. The pharmacy provides prednisone 5 mg
tablets. How many tablets should the nurse administer per dose?
20 mg ÷ 5 mg/tablet = 4 tablets🟨
🟨
Rationale: Divide the ordered dose by the strengthper tablet to calculate the number of tablets.
5. A provider orders metformin 1,000 mg PO twice daily. The pharmacy provides metformin 500
mg tablets. How many tablets should the nurse administer per dose?
1,000 mg ÷ 500 mg/tablet = 2 tablets🟨
🟨
Rationale: Divide the ordered dose by the tabletstrength to determine the number of tablets.
6. A patient is prescribed cephalexin 250 mg PO every 6 hours. The pharmacy provides cephalexin
125 mg/5 mL suspension. How many mL should the nurse administer per dose?
(250 mg × 5 mL) ÷ 125 mg = 10 mL🟨
🟨
Rationale: Use dimensional analysis: (ordered dose× volume per strength) ÷ strength = volume
to administer.
7. A provider orders omeprazole 40 mg PO daily. The pharmacy provides omeprazole 20 mg
capsules. How many capsules should the nurse administer per dose?
40 mg ÷ 20 mg/capsule = 2 capsules🟨
🟨
Rationale: Divide the ordered dose by the capsulestrength to calculate the number of capsules.
8. A patient is prescribed digoxin 0.125 mg PO daily. The pharmacy provides digoxin 0.25 mg
tablets. How many tablets should the nurse administer per dose?
0.125 mg ÷ 0.25 mg/tablet = 0.5 tablets🟨
🟨
Rationale: Divide the ordered dose by the tabletstrength; 0.5 tablets require cutting the tablet in
half.
9. A provider orders levothyroxine 0.1 mg PO daily. The pharmacy provides levothyroxine 100 mcg
tablets. How many tablets should the nurse administer per dose?
0.1 mg × (1,000 mcg/1 mg) ÷ 100 mcg/tablet = 1 tablet🟨
🟨
Rationale: Convert mg to mcg (0.1 mg = 100 mcg),then divide by tablet strength to calculate
the number of tablets.
10.A patient is prescribed fluoxetine 20 mg PO daily. The pharmacy provides fluoxetine 10 mg/5 mL
solution. How many mL should the nurse administer per dose?
(20 mg × 5 mL) ÷ 10 mg = 10 mL🟨
🟨
Rationale: Use dimensional analysis: (ordered dose× volume per strength) ÷ strength = volume
to administer.
IV Drip Rates
11.A provider orders 1,000 mL of 0.9% NS to infuse over 8 hours. The IV tubing has a drop factor
of 10 gtt/mL. What is the drip rate in gtt/min? (Round to the nearest whole number.)
(1,000 mL × 10 gtt/mL) ÷ (8 hr × 60 min/hr) = 2,083.33 ÷ 480 = 21 gtt/min🟨
🟨
Rationale: Use dimensional analysis: (total volume× drop factor) ÷ total minutes = drip rate.
12.A patient is prescribed 500 mL of D5W to infuse over 4 hours. The IV tubing has a drop factor of
15 gtt/mL. What is the drip rate in gtt/min? (Round to the nearest whole number.)
