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 for an adult
patient. You have tablets labeled 250 mg each. How many
tablets should you give?
A. 2 tablets
B. 3 tablets
C. 4 tablets
D. 5 tablets
Correct Answer: B. 3 tablets
,Rationale — Correct (B): Multiply the tablet strength by number
of tablets to equal the ordered dose: 250 mg × 3 = 750 mg. Give
3 tablets. This uses straightforward whole-number
multiplication.
Rationale — A (incorrect): 2 tablets × 250 mg = 500 mg, which
underdoses the order.
Rationale — C (incorrect): 4 tablets × 250 mg = 1000 mg, which
overdoses the order.
Rationale — D (incorrect): 5 tablets × 250 mg = 1250 mg, a
larger overdose.
Teaching point: Multiply tablet strength × count to match
ordered 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 physician orders 80 mg of medication IV. The vial
contains 400 mg in 10 mL. How many mL will you draw up? (Do
not round.)
A. 1.0 mL
B. 2.0 mL
C. 4.0 mL
D. 20.0 mL
Correct Answer: B. 2.0 mL
,Rationale — Correct (B): Determine mg per mL: 400 mg ÷ 10 mL
= 40 mg/mL. Then divide desired dose by concentration: 80 mg
÷ 40 mg/mL = 2.0 mL.
Rationale — A (incorrect): 1.0 mL would deliver 40 mg (half the
ordered 80 mg).
Rationale — C (incorrect): 4.0 mL would deliver 160 mg (double
the ordered dose).
Rationale — D (incorrect): 20.0 mL treats vial total volume
incorrectly; 20 mL is not contained in the vial and would
overdose.
Teaching point: Find mg/mL first, then divide desired dose by
concentration.
Citation: Buchholz, S. (2024). Henke’s Med-Math: Dosage
Calculation, Preparation & Administration (10th ed.). Ch. 1.
3.
Reference: Ch. 1 — Fractions
Stem: The order is for 3/4 tablet of propantheline. Tablets are
scored and available as 1/2 tablets. How many 1/2 tablets are
required to equal 3/4 tablet?
A. 1 half-tablet
B. 1.5 half-tablets
C. 2 half-tablets
D. 3 half-tablets
Correct Answer: B. 1.5 half-tablets
, Rationale — Correct (B): Convert to common fractions: 3/4 ÷
1/2 = (3/4) × (2/1) = 6/4 = 3/2 = 1.5 halves. That is, one and
one-half of the 1/2 tablets.
Rationale — A (incorrect): 1 half-tablet = 1/2, which is less than
3/4.
Rationale — C (incorrect): 2 half-tablets = 1 whole tablet,
exceeding 3/4.
Rationale — D (incorrect): 3 half-tablets = 1.5 tablets (much
more than ordered).
Teaching point: Divide fraction desired by fraction available to
find pieces.
Citation: Buchholz, S. (2024). Henke’s Med-Math: Dosage
Calculation, Preparation & Administration (10th ed.). Ch. 1.
4.
Reference: Ch. 1 — Decimals
Stem: A medication label states 0.125 g per tablet. The order is
for 125 mg PO. How many tablets should be given?
A. 0.5 tablet
B. 1 tablet
C. 2 tablets
D. 4 tablets
Correct Answer: B. 1 tablet
Rationale — Correct (B): Convert 0.125 g to mg: 0.125 g × 1000
mg/g = 125 mg. So one tablet = 125 mg; give 1 tablet.
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 for an adult
patient. You have tablets labeled 250 mg each. How many
tablets should you give?
A. 2 tablets
B. 3 tablets
C. 4 tablets
D. 5 tablets
Correct Answer: B. 3 tablets
,Rationale — Correct (B): Multiply the tablet strength by number
of tablets to equal the ordered dose: 250 mg × 3 = 750 mg. Give
3 tablets. This uses straightforward whole-number
multiplication.
Rationale — A (incorrect): 2 tablets × 250 mg = 500 mg, which
underdoses the order.
Rationale — C (incorrect): 4 tablets × 250 mg = 1000 mg, which
overdoses the order.
Rationale — D (incorrect): 5 tablets × 250 mg = 1250 mg, a
larger overdose.
Teaching point: Multiply tablet strength × count to match
ordered 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 physician orders 80 mg of medication IV. The vial
contains 400 mg in 10 mL. How many mL will you draw up? (Do
not round.)
A. 1.0 mL
B. 2.0 mL
C. 4.0 mL
D. 20.0 mL
Correct Answer: B. 2.0 mL
,Rationale — Correct (B): Determine mg per mL: 400 mg ÷ 10 mL
= 40 mg/mL. Then divide desired dose by concentration: 80 mg
÷ 40 mg/mL = 2.0 mL.
Rationale — A (incorrect): 1.0 mL would deliver 40 mg (half the
ordered 80 mg).
Rationale — C (incorrect): 4.0 mL would deliver 160 mg (double
the ordered dose).
Rationale — D (incorrect): 20.0 mL treats vial total volume
incorrectly; 20 mL is not contained in the vial and would
overdose.
Teaching point: Find mg/mL first, then divide desired dose by
concentration.
Citation: Buchholz, S. (2024). Henke’s Med-Math: Dosage
Calculation, Preparation & Administration (10th ed.). Ch. 1.
3.
Reference: Ch. 1 — Fractions
Stem: The order is for 3/4 tablet of propantheline. Tablets are
scored and available as 1/2 tablets. How many 1/2 tablets are
required to equal 3/4 tablet?
A. 1 half-tablet
B. 1.5 half-tablets
C. 2 half-tablets
D. 3 half-tablets
Correct Answer: B. 1.5 half-tablets
, Rationale — Correct (B): Convert to common fractions: 3/4 ÷
1/2 = (3/4) × (2/1) = 6/4 = 3/2 = 1.5 halves. That is, one and
one-half of the 1/2 tablets.
Rationale — A (incorrect): 1 half-tablet = 1/2, which is less than
3/4.
Rationale — C (incorrect): 2 half-tablets = 1 whole tablet,
exceeding 3/4.
Rationale — D (incorrect): 3 half-tablets = 1.5 tablets (much
more than ordered).
Teaching point: Divide fraction desired by fraction available to
find pieces.
Citation: Buchholz, S. (2024). Henke’s Med-Math: Dosage
Calculation, Preparation & Administration (10th ed.). Ch. 1.
4.
Reference: Ch. 1 — Decimals
Stem: A medication label states 0.125 g per tablet. The order is
for 125 mg PO. How many tablets should be given?
A. 0.5 tablet
B. 1 tablet
C. 2 tablets
D. 4 tablets
Correct Answer: B. 1 tablet
Rationale — Correct (B): Convert 0.125 g to mg: 0.125 g × 1000
mg/g = 125 mg. So one tablet = 125 mg; give 1 tablet.
