HENKE'S MED-MATH
DOSAGE CALCULATION, PREPARATION
& ADMINISTRATION
10TH EDITION
• AUTHOR(S)SUSAN BUCHHOLZ
TEST BANK
1
Reference
Ch. 1 — Multiplying Whole Numbers
Question stem
A provider orders amoxicillin 125 mg per tablet: give 2 tablets
per dose, three times daily for 7 days. How many tablets will
the patient receive for the entire course?
A. 36 tablets
B. 42 tablets
C. 21 tablets
D. 56 tablets
,Correct answer
B. 42 tablets
Rationale — Correct (B)
Calculate tablets per day first: 2 tablets/dose × 3 doses/day = 6
tablets/day. Multiply by 7 days: 6 × 7 = 42 tablets total. This
uses simple whole-number multiplication as taught in Ch. 1.
Rationales — Incorrect
A. 36 tablets — Error: likely multiplied 6 tablets/day × 6 days
instead of 7 days; underdosing the course.
C. 21 tablets — Error: halving the correct result (perhaps
counted only once daily).
D. 56 tablets — Error: likely calculated 2 × (3 × 7) then doubled
again; overestimation would lead to extra doses.
Teaching point
Multiply dose × frequency × duration; track units (tablets/day ×
days).
Citation
Buchholz, S. (2024). Henke’s Med-Math: Dosage Calculation,
Preparation & Administration (10th ed.). Ch. 1.
2
Reference
Ch. 1 — Dividing Whole Numbers
,Question stem
A provider orders a total daily acetaminophen dose of 1,500 mg
to be given equally every 6 hours (QID). What is the milligram
amount per dose?
A. 375 mg per dose
B. 400 mg per dose
C. 250 mg per dose
D. 500 mg per dose
Correct answer
A. 375 mg per dose
Rationale — Correct (A)
Divide total daily dose by number of doses: 1,500 mg ÷ 4 doses
= 375 mg per dose. This follows Ch. 1 division of whole numbers
for dose partitioning.
Rationales — Incorrect
B. 400 mg — Error: 1,600 mg ÷ 4 would give 400; misreading
total dose as larger.
C. 250 mg — Error: 1,000 mg ÷ 4; underdose from incorrect
numerator.
D. 500 mg — Error: 1,500 ÷ 3 (three times/day), not QID; wrong
divisor.
Teaching point
Divide total daily dose by number of scheduled doses to get mg
per administration.
, Citation
Buchholz, S. (2024). Henke’s Med-Math: Dosage Calculation,
Preparation & Administration (10th ed.). Ch. 1.
3
Reference
Ch. 1 — Fractions
Question stem
A tablet contains 2 mg of a medication. The order is to give
three-quarters (¾) of a tablet. How many milligrams will the
patient receive?
A. 0.75 mg
B. 1.5 mg
C. 1.25 mg
D. 2.5 mg
Correct answer
B. 1.5 mg
Rationale — Correct (B)
Compute fraction of tablet: (3/4) × 2 mg = 1.5 mg. Multiply the
fraction by the whole-tablet strength, per Ch. 1 fraction
arithmetic.
Rationales — Incorrect
A. 0.75 mg — Error: used ¾ of 1 mg instead of 2 mg; incorrect
numerator.
DOSAGE CALCULATION, PREPARATION
& ADMINISTRATION
10TH EDITION
• AUTHOR(S)SUSAN BUCHHOLZ
TEST BANK
1
Reference
Ch. 1 — Multiplying Whole Numbers
Question stem
A provider orders amoxicillin 125 mg per tablet: give 2 tablets
per dose, three times daily for 7 days. How many tablets will
the patient receive for the entire course?
A. 36 tablets
B. 42 tablets
C. 21 tablets
D. 56 tablets
,Correct answer
B. 42 tablets
Rationale — Correct (B)
Calculate tablets per day first: 2 tablets/dose × 3 doses/day = 6
tablets/day. Multiply by 7 days: 6 × 7 = 42 tablets total. This
uses simple whole-number multiplication as taught in Ch. 1.
Rationales — Incorrect
A. 36 tablets — Error: likely multiplied 6 tablets/day × 6 days
instead of 7 days; underdosing the course.
C. 21 tablets — Error: halving the correct result (perhaps
counted only once daily).
D. 56 tablets — Error: likely calculated 2 × (3 × 7) then doubled
again; overestimation would lead to extra doses.
Teaching point
Multiply dose × frequency × duration; track units (tablets/day ×
days).
Citation
Buchholz, S. (2024). Henke’s Med-Math: Dosage Calculation,
Preparation & Administration (10th ed.). Ch. 1.
2
Reference
Ch. 1 — Dividing Whole Numbers
,Question stem
A provider orders a total daily acetaminophen dose of 1,500 mg
to be given equally every 6 hours (QID). What is the milligram
amount per dose?
A. 375 mg per dose
B. 400 mg per dose
C. 250 mg per dose
D. 500 mg per dose
Correct answer
A. 375 mg per dose
Rationale — Correct (A)
Divide total daily dose by number of doses: 1,500 mg ÷ 4 doses
= 375 mg per dose. This follows Ch. 1 division of whole numbers
for dose partitioning.
Rationales — Incorrect
B. 400 mg — Error: 1,600 mg ÷ 4 would give 400; misreading
total dose as larger.
C. 250 mg — Error: 1,000 mg ÷ 4; underdose from incorrect
numerator.
D. 500 mg — Error: 1,500 ÷ 3 (three times/day), not QID; wrong
divisor.
Teaching point
Divide total daily dose by number of scheduled doses to get mg
per administration.
, Citation
Buchholz, S. (2024). Henke’s Med-Math: Dosage Calculation,
Preparation & Administration (10th ed.). Ch. 1.
3
Reference
Ch. 1 — Fractions
Question stem
A tablet contains 2 mg of a medication. The order is to give
three-quarters (¾) of a tablet. How many milligrams will the
patient receive?
A. 0.75 mg
B. 1.5 mg
C. 1.25 mg
D. 2.5 mg
Correct answer
B. 1.5 mg
Rationale — Correct (B)
Compute fraction of tablet: (3/4) × 2 mg = 1.5 mg. Multiply the
fraction by the whole-tablet strength, per Ch. 1 fraction
arithmetic.
Rationales — Incorrect
A. 0.75 mg — Error: used ¾ of 1 mg instead of 2 mg; incorrect
numerator.
