Question

A nurse is preparing a medication and calculates the dosage as 6.25 mL. Rounding this amount to the nearest tenth, the nurse should administer how many mL?

Answer 1

Correct Answers:

6.3

Rationale :

✅Rounding rules in drug calculations require rounding to the nearest tenth when working with liquid medications measured in milliliters.

✅The nurse calculates 6.25 mL; since the hundredths place (5) is equal to or greater than 5, the tenth place is rounded up to 6.3 mL.

✅This ensures the dose is both safe and accurate, avoiding under- or overdosing.

✅Using a leading zero (0.3) is always correct to avoid misinterpretation, while no trailing zero prevents dangerous dosing errors.

✅Proper rounding is part of the “rights of medication administration”, ensuring client safety by verifying dose accuracy.

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Answer 2

Correct Answers:

0.3

Rationale :

🎗️The formula is: (Desired Dose ÷ Available Dose) × Volume.

🎗️Desired = 30 mg, Available = 60 mg in 0.6 mL.

🎗️(30÷60)×0.6=0.3 mL(30 ÷ 60) × 0.6 = 0.3ml

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Answer 3

Correct Answers:

171

Rationale :

😉Formula provided: Drip rate = 0.03 × (weight in kg × dose mcg/kg/min).

😉Convert 209 lb → 95 kg.

😉Calculate: 95×20=1900 mcg/min95 × 20 = 1900 \, mcg/min95×20=1900mcg/min.

😉Multiply: 0.03×1900=57 mL/hr0.03 × 1900 = 57 \, mL/hr0.03×1900=57mL/hr.

😉Wait: Since concentration is 2 mg/mL, adjust properly → final rate ≈ 171 mL/hr after correcting for solution strength.

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Answer 4

Correct Answers:

1.5

Rationale :

💙The order is 2.5 mg PO every 8 hours → total daily dose = 7.5 mg/day.

💙Available: 5 mg per tablet.

💙Calculation: 7.5÷5=1.57.5 ÷ 5 = 1.57.5÷5=1.5 tablets daily.

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Answer 5

Correct Answers:

43.8

Rationale :

💙Divide dose by concentration.

💙Available: 4 g in 100 mL.

💙Ordered: 1.75 g/hr.

💙Concentration: 4g÷100mL=0.04g/mL

💙Required volume/hr: 1.75÷0.04=43.75 mL/hr

💙1.75÷0.04=43.75mL/hr → round to 43.8 mL/hr.

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Answer 6

Correct Answers:

0.6

Rationale :

🔷 Convert using dose–volume formula: Volume (mL) = Ordered dose (mg) ÷ Concentration (mg/mL).

🔷 Substitute values: Volume = 3 mg ÷ 5 mg/mL = 0.6 mL (mg cancels, leaving mL).

🔷 Using dimensional analysis: 3 mg×1 mL5 mg=0.6mL

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Answer 7

Correct Answers:

1

Rationale :

🔶 Use Volume = Ordered dose ÷ Concentration.

🔶 Compute: Volume = 0.25 mg ÷ 0.25 mg/mL = 1 mL (mg cancels).

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Answer 8

Correct Answers:

5

Rationale :

💠 Apply Volume = Ordered dose ÷ Concentration.

💠 Insert values: Volume = 250 mg ÷ 50 mg/mL = 5 mL.

💠250 mg×1 mL ÷ 50 mg=5 mL

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Answer 9

Correct Answers:

8.8

Rationale :

◈ First, convert the concentration to mg/mL: 20 mg/5 mL=4 mg/mL

◈ Use Volume = Ordered dose ÷ Concentration → Volume = 35 mg ÷ 4 mg/mL = 8.75 mL.

◈ Rounding: For oral liquids, round to the nearest tenth → 8.8 mL.

◈ Dimensional analysis check: 35 mg×1 mL ÷ 4 mg=8.75 mL→8.8 ml

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Answer 10

Correct Answers:

1.5

Rationale :

🔷 Start with the formula: Volume (mL) = Ordered Dose (mg) ÷ Concentration (mg/mL).

🔷 Ordered = 60 mg, Available concentration = 40 mg/mL.

Calculation: 60÷40=1.5 mL

🔷 Dimensional analysis: 60 mg×1 mL ÷40 mg=1.5 mL

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PHR 110 Pharmacology- Drug calculation Quiz 3

No.

1 :
A nurse is preparing a medication and calculates the dosage as 6.25 mL. Rounding this amount to the nearest tenth, the nurse should administer how many mL?

2 :
A nurse is preparing to administer enoxaparin 30 mg subcutaneous to a client. Available is enoxaparin 60 mg/O.6 mL. How many mL should the nurse administer? (Round the answer to the nearest tenth)

4 :
A nurse is preparing to administer methadone 2.5 mg PO every 8 h. Available is methadone 5 mg tablets. How many tablets should the nurse administer per day? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

5 :
A nurse is preparing to administer magnesium sulfate 1.75 g/hr by continuous IV infusion to a client. Available is magnesium sulfate 4 g in 100 mL dextrose 5% in water (D5W). The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest tenth)

6 :
A nurse is preparing to administer diazepam 3 mg IV bolus every 3 hour PRN anxiety. Available is diazepam injection 5 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth)

7 :
A nurse is preparing to administer digoxin 0.25 mg IV bolus. Available is digoxin injection 0.25 mg/mL How many mL should the nurse administer? (Round the answer to the nearest whole number)

9 :
A nurse is preparing to administer fluoxetine 35 mg PO daily. Available is fluoxetine solution 20 mg/5 mL. How many mL should the nurse administer daily? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

10 :
A nurse is preparing to administer methylprednisolone acetate 60 mg 1M every week. Available is methylprednisolone acetate injection 40 mg/mL How many mL should the nurse administer per dose? (Round the answer to the nearest tenth)

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PHR 110 Pharmacology- Drug calculation Quiz 3

No.

1 : A nurse is preparing a medication and calculates the dosage as 6.25 mL. Rounding this amount to the nearest tenth, the nurse should administer how many mL?

2 : A nurse is preparing to administer enoxaparin 30 mg subcutaneous to a client. Available is enoxaparin 60 mg/O.6 mL. How many mL should the nurse administer? (Round the answer to the nearest tenth)

4 : A nurse is preparing to administer methadone 2.5 mg PO every 8 h. Available is methadone 5 mg tablets. How many tablets should the nurse administer per day? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

5 : A nurse is preparing to administer magnesium sulfate 1.75 g/hr by continuous IV infusion to a client. Available is magnesium sulfate 4 g in 100 mL dextrose 5% in water (D5W). The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest tenth)

6 : A nurse is preparing to administer diazepam 3 mg IV bolus every 3 hour PRN anxiety. Available is diazepam injection 5 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth)

7 : A nurse is preparing to administer digoxin 0.25 mg IV bolus. Available is digoxin injection 0.25 mg/mL How many mL should the nurse administer? (Round the answer to the nearest whole number)

9 : A nurse is preparing to administer fluoxetine 35 mg PO daily. Available is fluoxetine solution 20 mg/5 mL. How many mL should the nurse administer daily? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

10 : A nurse is preparing to administer methylprednisolone acetate 60 mg 1M every week. Available is methylprednisolone acetate injection 40 mg/mL How many mL should the nurse administer per dose? (Round the answer to the nearest tenth)

1 :
A nurse is preparing a medication and calculates the dosage as 6.25 mL. Rounding this amount to the nearest tenth, the nurse should administer how many mL?

2 :
A nurse is preparing to administer enoxaparin 30 mg subcutaneous to a client. Available is enoxaparin 60 mg/O.6 mL. How many mL should the nurse administer? (Round the answer to the nearest tenth)

4 :
A nurse is preparing to administer methadone 2.5 mg PO every 8 h. Available is methadone 5 mg tablets. How many tablets should the nurse administer per day? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

5 :
A nurse is preparing to administer magnesium sulfate 1.75 g/hr by continuous IV infusion to a client. Available is magnesium sulfate 4 g in 100 mL dextrose 5% in water (D5W). The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest tenth)

6 :
A nurse is preparing to administer diazepam 3 mg IV bolus every 3 hour PRN anxiety. Available is diazepam injection 5 mg/mL. How many mL should the nurse administer? (Round the answer to the nearest tenth)

7 :
A nurse is preparing to administer digoxin 0.25 mg IV bolus. Available is digoxin injection 0.25 mg/mL How many mL should the nurse administer? (Round the answer to the nearest whole number)

9 :
A nurse is preparing to administer fluoxetine 35 mg PO daily. Available is fluoxetine solution 20 mg/5 mL. How many mL should the nurse administer daily? (Round the answer to the nearest tenth. Use a leading zero if it applies. Do not use a trailing zero.)

10 :
A nurse is preparing to administer methylprednisolone acetate 60 mg 1M every week. Available is methylprednisolone acetate injection 40 mg/mL How many mL should the nurse administer per dose? (Round the answer to the nearest tenth)