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 2 tablets of acetaminophen 250 mg PO now.
The medication cabinet contains 250 mg scored tablets. How
many milligrams will the patient receive with the ordered dose?
A. 125 mg
B. 250 mg
C. 500 mg
D. 750 mg
,Correct Answer: C. 500 mg
Rationale — Correct (C):
Multiply the number of tablets by the strength per tablet: 2
tablets × 250 mg/tablet = 500 mg. This follows Henke’s
approach: align units, then multiply whole numbers to obtain
total dose.
Rationale — Incorrect:
A. 125 mg — Incorrect: represents half of one 250 mg tablet
(division error), not the ordered two tablets. Could underdose
the patient.
B. 250 mg — Incorrect: equals one tablet, not two; likely a
counting error.
D. 750 mg — Incorrect: result of 3 × 250 mg; an extra tablet has
been added in error.
Teaching Point:
Multiply count × strength; check units before finalizing dose.
Citation:
Buchholz, S. (2024). Henke’s Med-Math: Dosage Calculation,
Preparation & Administration (10th ed.). Ch. 1.
2
Reference
Ch. 1 — Dividing Whole Numbers
,Stem
A patient is prescribed 600 mg of an antibiotic PO. The
pharmacy supplies 150 mg scored tablets. How many whole
tablets should the nurse administer?
A. 2 tablets
B. 3 tablets
C. 4 tablets
D. 5 tablets
Correct Answer: C. 4 tablets
Rationale — Correct (C):
Divide the ordered amount by strength per tablet: 600 mg ÷
150 mg/tablet = 4 tablets. Henke’s method: confirm units cancel
and round only when tablet scoring allows whole or half tablets
per policy.
Rationale — Incorrect:
A. 2 tablets — Incorrect: calculates 300 mg total; underdose
due to division ×2 error.
B. 3 tablets — Incorrect: equals 450 mg; indicates incorrect
division or misplacement of digits.
D. 5 tablets — Incorrect: equals 750 mg; extra tablet, risk of
overdose.
Teaching Point:
Divide order by unit strength; ensure result is allowable
(whole/half tablet per policy).
, Citation:
Buchholz, S. (2024). Henke’s Med-Math: Dosage Calculation,
Preparation & Administration (10th ed.). Ch. 1.
3
Reference
Ch. 1 — Fractions
Stem
A medication order calls for ¾ of a 200-mL bottle to be
administered over the shift. How many milliliters should the
nurse prepare?
A. 50 mL
B. 100 mL
C. 150 mL
D. 175 mL
Correct Answer: C. 150 mL
Rationale — Correct (C):
Calculate ¾ of 200 mL: (3/4) × 200 mL = 150 mL. Henke
emphasizes converting the fraction to a multiplication operation
and performing integer arithmetic to maintain accuracy.
Rationale — Incorrect:
A. 50 mL — Incorrect: equals 1/4 of 200 mL, reversed fraction
error.
B. 100 mL — Incorrect: equals 1/2 of 200 mL, misidentifying ¾
DOSAGE CALCULATION, PREPARATION
& ADMINISTRATION
10TH EDITION
• AUTHOR(S)SUSAN BUCHHOLZ
TEST BANK
1
Reference
Ch. 1 — Multiplying Whole Numbers
Stem
A provider orders 2 tablets of acetaminophen 250 mg PO now.
The medication cabinet contains 250 mg scored tablets. How
many milligrams will the patient receive with the ordered dose?
A. 125 mg
B. 250 mg
C. 500 mg
D. 750 mg
,Correct Answer: C. 500 mg
Rationale — Correct (C):
Multiply the number of tablets by the strength per tablet: 2
tablets × 250 mg/tablet = 500 mg. This follows Henke’s
approach: align units, then multiply whole numbers to obtain
total dose.
Rationale — Incorrect:
A. 125 mg — Incorrect: represents half of one 250 mg tablet
(division error), not the ordered two tablets. Could underdose
the patient.
B. 250 mg — Incorrect: equals one tablet, not two; likely a
counting error.
D. 750 mg — Incorrect: result of 3 × 250 mg; an extra tablet has
been added in error.
Teaching Point:
Multiply count × strength; check units before finalizing dose.
Citation:
Buchholz, S. (2024). Henke’s Med-Math: Dosage Calculation,
Preparation & Administration (10th ed.). Ch. 1.
2
Reference
Ch. 1 — Dividing Whole Numbers
,Stem
A patient is prescribed 600 mg of an antibiotic PO. The
pharmacy supplies 150 mg scored tablets. How many whole
tablets should the nurse administer?
A. 2 tablets
B. 3 tablets
C. 4 tablets
D. 5 tablets
Correct Answer: C. 4 tablets
Rationale — Correct (C):
Divide the ordered amount by strength per tablet: 600 mg ÷
150 mg/tablet = 4 tablets. Henke’s method: confirm units cancel
and round only when tablet scoring allows whole or half tablets
per policy.
Rationale — Incorrect:
A. 2 tablets — Incorrect: calculates 300 mg total; underdose
due to division ×2 error.
B. 3 tablets — Incorrect: equals 450 mg; indicates incorrect
division or misplacement of digits.
D. 5 tablets — Incorrect: equals 750 mg; extra tablet, risk of
overdose.
Teaching Point:
Divide order by unit strength; ensure result is allowable
(whole/half tablet per policy).
, Citation:
Buchholz, S. (2024). Henke’s Med-Math: Dosage Calculation,
Preparation & Administration (10th ed.). Ch. 1.
3
Reference
Ch. 1 — Fractions
Stem
A medication order calls for ¾ of a 200-mL bottle to be
administered over the shift. How many milliliters should the
nurse prepare?
A. 50 mL
B. 100 mL
C. 150 mL
D. 175 mL
Correct Answer: C. 150 mL
Rationale — Correct (C):
Calculate ¾ of 200 mL: (3/4) × 200 mL = 150 mL. Henke
emphasizes converting the fraction to a multiplication operation
and performing integer arithmetic to maintain accuracy.
Rationale — Incorrect:
A. 50 mL — Incorrect: equals 1/4 of 200 mL, reversed fraction
error.
B. 100 mL — Incorrect: equals 1/2 of 200 mL, misidentifying ¾
