HENKE'S MED-MATH
DOSAGE CALCULATION, PREPARATION
& ADMINISTRATION
10TH EDITION
• AUTHOR(S)SUSAN BUCHHOLZ
TEST BANK
1
Reference
Ch. 1 — Multiplying Whole Numbers
Stem
A provider orders acetaminophen 750 mg PO. The pharmacy
gives tablets labeled 250 mg each. How many milligrams will
the nurse administer if the patient receives three tablets as
ordered? (Show the total mg administered.)
A. 500 mg
B. 750 mg
,C. 1000 mg
D. 1250 mg
Correct Answer: B. 750 mg
Rationales
• Correct (B): Multiply tablet strength by number of tablets:
250 mg × 3 = 750 mg. This is the straightforward whole-
number multiplication method taught in Ch. 1.
• A (500 mg): Error: likely calculated 250 mg × 2 instead of ×
3. Under-dosing risk.
• C (1000 mg): Error: likely calculated 250 mg × 4. Over-
administration risk.
• D (1250 mg): Error: arithmetic slip (250 × 5). Wrong tablet
count.
Teaching Point: Multiply strength × number of units; check
tablet strength and count.
Citation: Buchholz, S. (2024). Henke’s Med-Math: Dosage
Calculation, Preparation & Administration (10th ed.). Ch. 1.
2
Reference
Ch. 1 — Multiplying Whole Numbers
Stem
A nurse must prepare 8 doses of a liquid medication. Each dose
,is 15 mL. How many milliliters in total must the nurse prepare
for all 8 doses?
A. 100 mL
B. 110 mL
C. 120 mL
D. 125 mL
Correct Answer: C. 120 mL
Rationales
• Correct (C): Multiply volume per dose × number of doses:
15 mL × 8 = 120 mL.
• A (100 mL): Error: used 10 mL × 10 or miscounted doses.
Under-preparation.
• B (110 mL): Error: arithmetic error (15 × 7 + 5).
• D (125 mL): Error: arithmetic slip (15 × 8 = 120, not 125).
Teaching Point: For batch prep multiply single dose by number
of doses to avoid shortages.
Citation: Buchholz, S. (2024). Henke’s Med-Math... Ch. 1.
3
Reference
Ch. 1 — Dividing Whole Numbers
Stem
A vial contains 1,200 mg of medication. The ordered dose is 300
, mg per administration. How many full 300 mg doses can be
drawn from the vial?
A. 3 doses
B. 4 doses
C. 5 doses
D. 6 doses
Correct Answer: B. 4 doses
Rationales
• Correct (B): Divide total available by dose: 1200 mg ÷ 300
mg = 4 doses. Exact division.
• A (3 doses): Error: underestimation (1200 ÷ 300 = 4, not 3).
Could waste drug or delay therapy.
• C (5 doses): Error: incorrect division (would require 1500
mg total).
• D (6 doses): Error: miscalculation (would require 1800 mg).
Teaching Point: Use total ÷ ordered dose to find number of full
doses available.
Citation: Buchholz, S. (2024). Henke’s Med-Math... Ch. 1.
4
Reference
Ch. 1 — Dividing Whole Numbers
DOSAGE CALCULATION, PREPARATION
& ADMINISTRATION
10TH EDITION
• AUTHOR(S)SUSAN BUCHHOLZ
TEST BANK
1
Reference
Ch. 1 — Multiplying Whole Numbers
Stem
A provider orders acetaminophen 750 mg PO. The pharmacy
gives tablets labeled 250 mg each. How many milligrams will
the nurse administer if the patient receives three tablets as
ordered? (Show the total mg administered.)
A. 500 mg
B. 750 mg
,C. 1000 mg
D. 1250 mg
Correct Answer: B. 750 mg
Rationales
• Correct (B): Multiply tablet strength by number of tablets:
250 mg × 3 = 750 mg. This is the straightforward whole-
number multiplication method taught in Ch. 1.
• A (500 mg): Error: likely calculated 250 mg × 2 instead of ×
3. Under-dosing risk.
• C (1000 mg): Error: likely calculated 250 mg × 4. Over-
administration risk.
• D (1250 mg): Error: arithmetic slip (250 × 5). Wrong tablet
count.
Teaching Point: Multiply strength × number of units; check
tablet strength and count.
Citation: Buchholz, S. (2024). Henke’s Med-Math: Dosage
Calculation, Preparation & Administration (10th ed.). Ch. 1.
2
Reference
Ch. 1 — Multiplying Whole Numbers
Stem
A nurse must prepare 8 doses of a liquid medication. Each dose
,is 15 mL. How many milliliters in total must the nurse prepare
for all 8 doses?
A. 100 mL
B. 110 mL
C. 120 mL
D. 125 mL
Correct Answer: C. 120 mL
Rationales
• Correct (C): Multiply volume per dose × number of doses:
15 mL × 8 = 120 mL.
• A (100 mL): Error: used 10 mL × 10 or miscounted doses.
Under-preparation.
• B (110 mL): Error: arithmetic error (15 × 7 + 5).
• D (125 mL): Error: arithmetic slip (15 × 8 = 120, not 125).
Teaching Point: For batch prep multiply single dose by number
of doses to avoid shortages.
Citation: Buchholz, S. (2024). Henke’s Med-Math... Ch. 1.
3
Reference
Ch. 1 — Dividing Whole Numbers
Stem
A vial contains 1,200 mg of medication. The ordered dose is 300
, mg per administration. How many full 300 mg doses can be
drawn from the vial?
A. 3 doses
B. 4 doses
C. 5 doses
D. 6 doses
Correct Answer: B. 4 doses
Rationales
• Correct (B): Divide total available by dose: 1200 mg ÷ 300
mg = 4 doses. Exact division.
• A (3 doses): Error: underestimation (1200 ÷ 300 = 4, not 3).
Could waste drug or delay therapy.
• C (5 doses): Error: incorrect division (would require 1500
mg total).
• D (6 doses): Error: miscalculation (would require 1800 mg).
Teaching Point: Use total ÷ ordered dose to find number of full
doses available.
Citation: Buchholz, S. (2024). Henke’s Med-Math... Ch. 1.
4
Reference
Ch. 1 — Dividing Whole Numbers
