Test Bank – Henke’s Med-Math
10th Edition by Susan Buchholz
Dosage Calculation & Drug
Administration All Chapters 1–
10 Updated A+ Verified
[DOCUMENT TITLE]
,Chapter 1: Arithmetic Needed for Dosage
MULTIPLE CHOICE QUESTIONS
Question 1
A provider orders amoxicillin 500 mg PO every 8 hours for 7 days. The patient will take 3
tablets per dose (each tablet is 500 mg). How many tablets will the nurse instruct the
patient to obtain for the full 7-day course?
A) 21 tablets
B) 42 tablets
C) 63 tablets
D) 84 tablets
Answer: C) 63 tablets
Client Needs: Physiological Integrity | Cognitive Level: Application | Integrated
Process: Teaching/Learning | Page Reference: Ch. 1, Multiplying Whole Numbers
Step-by-Step Rationale:
1. Doses per day = 24 hours ÷ 8 hours = 3 doses/day
2. Tablets per dose = 3 tablets/dose
3. Total tablets = 3 tablets/dose × 3 doses/day × 7 days = 63 tablets
Common Errors:
A (21 tablets): Multiplied tablets per dose by days only (3 × 7 = 21), omitting
doses per day → would underdose the patient
B (42 tablets): Likely used 2 tablets/dose or miscalculated doses per day
D (84 tablets): Likely assumed 4 tablets/dose or 4 doses/day → overdose risk
,Clinical Pearl: When a patient will self-administer at home, verify they understand the
complete calculation to ensure they obtain enough medication. Always document the
calculation in the medication administration record.
Question 2
A patient was instructed to drink 25 oz of water within 2 hours but was only able to
drink 15 oz. What portion of the water remained?
A) 2/5
B) 3/5
C) 2/25
D) 25/25
Answer: A) 2/5
Client Needs: Physiological Integrity | Cognitive Level: Comprehension | Integrated
Process: Teaching/Learning | Page Reference: Ch. 1, Fractions
Step-by-Step Rationale:
1. Water remaining = 25 oz − 15 oz = 10 oz
2. Portion remaining = 10 oz ÷ 25 oz = 10/25
3. Reduce fraction: Find largest number that divides evenly into numerator and
denominator (5)
4. 10 ÷ 5 = 2; 25 ÷ 5 = 5
5. Reduced fraction = 2/5
Common Errors:
, B (3/5): This represents the portion consumed (15/25 = 3/5), not the portion
remaining
C (2/25): Did not reduce fraction correctly
D (25/25): Assumed all water remained
Clinical Pearl: When documenting intake and output, ensure you accurately calculate
both consumed and remaining portions. Always reduce fractions to lowest terms for
clear communication.
Question 3
A patient was prescribed 240 mL of Ensure by mouth as a supplement but consumed
only 100 mL. What portion of the Ensure remained?
A) 5/12
B) 7/12
C) 100/240
D) 240/240
Answer: B) 7/12
Client Needs: Physiological Integrity | Cognitive Level: Comprehension | Integrated
Process: Teaching/Learning | Page Reference: Ch. 1, Fractions
Step-by-Step Rationale:
1. Ensure remaining = 240 mL − 100 mL = 140 mL
2. Portion remaining = 140 mL ÷ 240 mL = 140/240
3. Reduce fraction: Find largest number that divides evenly (20)
4. 140 ÷ 20 = 7; 240 ÷ 20 = 12
5. Reduced fraction = 7/12
10th Edition by Susan Buchholz
Dosage Calculation & Drug
Administration All Chapters 1–
10 Updated A+ Verified
[DOCUMENT TITLE]
,Chapter 1: Arithmetic Needed for Dosage
MULTIPLE CHOICE QUESTIONS
Question 1
A provider orders amoxicillin 500 mg PO every 8 hours for 7 days. The patient will take 3
tablets per dose (each tablet is 500 mg). How many tablets will the nurse instruct the
patient to obtain for the full 7-day course?
A) 21 tablets
B) 42 tablets
C) 63 tablets
D) 84 tablets
Answer: C) 63 tablets
Client Needs: Physiological Integrity | Cognitive Level: Application | Integrated
Process: Teaching/Learning | Page Reference: Ch. 1, Multiplying Whole Numbers
Step-by-Step Rationale:
1. Doses per day = 24 hours ÷ 8 hours = 3 doses/day
2. Tablets per dose = 3 tablets/dose
3. Total tablets = 3 tablets/dose × 3 doses/day × 7 days = 63 tablets
Common Errors:
A (21 tablets): Multiplied tablets per dose by days only (3 × 7 = 21), omitting
doses per day → would underdose the patient
B (42 tablets): Likely used 2 tablets/dose or miscalculated doses per day
D (84 tablets): Likely assumed 4 tablets/dose or 4 doses/day → overdose risk
,Clinical Pearl: When a patient will self-administer at home, verify they understand the
complete calculation to ensure they obtain enough medication. Always document the
calculation in the medication administration record.
Question 2
A patient was instructed to drink 25 oz of water within 2 hours but was only able to
drink 15 oz. What portion of the water remained?
A) 2/5
B) 3/5
C) 2/25
D) 25/25
Answer: A) 2/5
Client Needs: Physiological Integrity | Cognitive Level: Comprehension | Integrated
Process: Teaching/Learning | Page Reference: Ch. 1, Fractions
Step-by-Step Rationale:
1. Water remaining = 25 oz − 15 oz = 10 oz
2. Portion remaining = 10 oz ÷ 25 oz = 10/25
3. Reduce fraction: Find largest number that divides evenly into numerator and
denominator (5)
4. 10 ÷ 5 = 2; 25 ÷ 5 = 5
5. Reduced fraction = 2/5
Common Errors:
, B (3/5): This represents the portion consumed (15/25 = 3/5), not the portion
remaining
C (2/25): Did not reduce fraction correctly
D (25/25): Assumed all water remained
Clinical Pearl: When documenting intake and output, ensure you accurately calculate
both consumed and remaining portions. Always reduce fractions to lowest terms for
clear communication.
Question 3
A patient was prescribed 240 mL of Ensure by mouth as a supplement but consumed
only 100 mL. What portion of the Ensure remained?
A) 5/12
B) 7/12
C) 100/240
D) 240/240
Answer: B) 7/12
Client Needs: Physiological Integrity | Cognitive Level: Comprehension | Integrated
Process: Teaching/Learning | Page Reference: Ch. 1, Fractions
Step-by-Step Rationale:
1. Ensure remaining = 240 mL − 100 mL = 140 mL
2. Portion remaining = 140 mL ÷ 240 mL = 140/240
3. Reduce fraction: Find largest number that divides evenly (20)
4. 140 ÷ 20 = 7; 240 ÷ 20 = 12
5. Reduced fraction = 7/12
