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: “Take 2 tablets PO every 8 hours for 7
days.” How many tablets should the nurse dispense to the
patient?
Options:
A. 21 tablets
B. 42 tablets
C. 28 tablets
D. 56 tablets
Correct Answer: B. 42 tablets
,Rationale — Correct (B): Multiply dose × number of doses per
day × days. Every 8 hours = 3 doses/day. Calculation: 2 tablets ×
3 doses/day × 7 days = 42 tablets. Dispense at least 42 tablets.
Rationale — A: (21) Likely multiplied 2 tablets × 7 days but
omitted frequency (3/day), under-dispensing risk.
Rationale — C: (28) Likely used 4 doses/day (every 6 hr) or
2×14, wrong frequency—may under-treat.
Rationale — D: (56) Likely used 4 doses/day ×7 days ×2 tablets
= over-dispense; wrong frequency assumption.
Teaching Point: Multiply dose × doses per day × days to
determine total tablets.
Citation: Buchholz, S. (2024). Henke’s Med-Math: Dosage
Calculation, Preparation & Administration (10th ed.). Ch. 1.
2)
Reference: Ch. 1 — Dividing Whole Numbers
Stem: The pharmacy dispensed 120 tablets. The patient is to
take 3 tablets daily. For how many days will the supply last?
Options:
A. 30 days
B. 36 days
C. 40 days
D. 45 days
Correct Answer: C. 40 days
,Rationale — Correct (C): Divide total tablets by tablets/day. 120
tablets ÷ 3 tablets/day = 40 days.
Rationale — A: (30) Results from 120 ÷ 4 (incorrect
tablets/day).
Rationale — B: (36) Non-integer error or mistaken arithmetic;
underestimates supply.
Rationale — D: (45) Overestimates days; dividing by ≈2.67
instead of 3.
Teaching Point: Use total ÷ daily quantity to find days supply.
Citation: Buchholz, S. (2024). Henke’s Med-Math … Ch. 1.
3)
Reference: Ch. 1 — Fractions (Multiplying Fractions)
Stem: A pediatric order reads: “Give ¾ tablet PO twice daily for
10 days.” How many whole tablets are required to fill the 10-
day supply?
Options:
A. 7.5 tablets
B. 15 tablets
C. 10 tablets
D. 22.5 tablets
Correct Answer: B. 15 tablets
Rationale — Correct (B): Calculate total tablets: (¾ tablet × 2
doses/day) = 1.5 tablets/day. Over 10 days: 1.5 × 10 = 15
tablets.
, Rationale — A: (7.5) Probably forgot to multiply by 2 doses/day
or halved the result.
Rationale — C: (10) Assumes one tablet/day—incorrect
frequency handling.
Rationale — D: (22.5) Likely multiplied 1.5 × 15 days or
arithmetic error; over-dispensing.
Teaching Point: Multiply fractional dose × doses/day × days;
convert fractions before multiplying.
Citation: Buchholz, S. (2024). Henke’s Med-Math … Ch. 1.
4)
Reference: Ch. 1 — Decimals (Volume from Concentration)
Stem: The medication is available as 5 mg/mL. The order is for
12.5 mg IM. What volume (mL) should the nurse draw up?
Options:
A. 0.25 mL
B. 1.25 mL
C. 2.5 mL
D. 3.0 mL
Correct Answer: C. 2.5 mL
Rationale — Correct (C): Use volume = ordered dose ÷
concentration. 12.5 mg ÷ 5 mg/mL = 2.5 mL.
Rationale — A: (0.25 mL) Decimal point error ×10 too small —
under-dosing risk.
Rationale — B: (1.25 mL) Half of correct volume; likely used 10
DOSAGE CALCULATION, PREPARATION
& ADMINISTRATION
10TH EDITION
• AUTHOR(S)SUSAN BUCHHOLZ
TEST BANK
1)
Reference: Ch. 1 — Multiplying Whole Numbers
Stem: A provider orders: “Take 2 tablets PO every 8 hours for 7
days.” How many tablets should the nurse dispense to the
patient?
Options:
A. 21 tablets
B. 42 tablets
C. 28 tablets
D. 56 tablets
Correct Answer: B. 42 tablets
,Rationale — Correct (B): Multiply dose × number of doses per
day × days. Every 8 hours = 3 doses/day. Calculation: 2 tablets ×
3 doses/day × 7 days = 42 tablets. Dispense at least 42 tablets.
Rationale — A: (21) Likely multiplied 2 tablets × 7 days but
omitted frequency (3/day), under-dispensing risk.
Rationale — C: (28) Likely used 4 doses/day (every 6 hr) or
2×14, wrong frequency—may under-treat.
Rationale — D: (56) Likely used 4 doses/day ×7 days ×2 tablets
= over-dispense; wrong frequency assumption.
Teaching Point: Multiply dose × doses per day × days to
determine total tablets.
Citation: Buchholz, S. (2024). Henke’s Med-Math: Dosage
Calculation, Preparation & Administration (10th ed.). Ch. 1.
2)
Reference: Ch. 1 — Dividing Whole Numbers
Stem: The pharmacy dispensed 120 tablets. The patient is to
take 3 tablets daily. For how many days will the supply last?
Options:
A. 30 days
B. 36 days
C. 40 days
D. 45 days
Correct Answer: C. 40 days
,Rationale — Correct (C): Divide total tablets by tablets/day. 120
tablets ÷ 3 tablets/day = 40 days.
Rationale — A: (30) Results from 120 ÷ 4 (incorrect
tablets/day).
Rationale — B: (36) Non-integer error or mistaken arithmetic;
underestimates supply.
Rationale — D: (45) Overestimates days; dividing by ≈2.67
instead of 3.
Teaching Point: Use total ÷ daily quantity to find days supply.
Citation: Buchholz, S. (2024). Henke’s Med-Math … Ch. 1.
3)
Reference: Ch. 1 — Fractions (Multiplying Fractions)
Stem: A pediatric order reads: “Give ¾ tablet PO twice daily for
10 days.” How many whole tablets are required to fill the 10-
day supply?
Options:
A. 7.5 tablets
B. 15 tablets
C. 10 tablets
D. 22.5 tablets
Correct Answer: B. 15 tablets
Rationale — Correct (B): Calculate total tablets: (¾ tablet × 2
doses/day) = 1.5 tablets/day. Over 10 days: 1.5 × 10 = 15
tablets.
, Rationale — A: (7.5) Probably forgot to multiply by 2 doses/day
or halved the result.
Rationale — C: (10) Assumes one tablet/day—incorrect
frequency handling.
Rationale — D: (22.5) Likely multiplied 1.5 × 15 days or
arithmetic error; over-dispensing.
Teaching Point: Multiply fractional dose × doses/day × days;
convert fractions before multiplying.
Citation: Buchholz, S. (2024). Henke’s Med-Math … Ch. 1.
4)
Reference: Ch. 1 — Decimals (Volume from Concentration)
Stem: The medication is available as 5 mg/mL. The order is for
12.5 mg IM. What volume (mL) should the nurse draw up?
Options:
A. 0.25 mL
B. 1.25 mL
C. 2.5 mL
D. 3.0 mL
Correct Answer: C. 2.5 mL
Rationale — Correct (C): Use volume = ordered dose ÷
concentration. 12.5 mg ÷ 5 mg/mL = 2.5 mL.
Rationale — A: (0.25 mL) Decimal point error ×10 too small —
under-dosing risk.
Rationale — B: (1.25 mL) Half of correct volume; likely used 10
