20 IV Infusion-Rate Practice Questions
Practise dividing a fictional volume by a duration expressed in hours. Several questions require converting minutes to a decimal part of an hour before calculating.
Use fictional or tutor-provided values only. These pages explain arithmetic and do not select, recommend, verify or administer treatment. Do not enter patient information or use DosePractice in a clinical workflow.
Formula
rate = volume ÷ time in hours
How to use these questions
Work each question on paper or in a separate note before opening the answer. Keep the units beside every number and write the formula before substituting values.
The questions are deliberately fictional and test arithmetic only. Real medicines, patient factors, limits, local policy and equipment checks are outside DosePractice’s purpose.
A repeatable checking method
- Identify what the question asks for and write its unit.
- Convert time or measurement units before calculating.
- Substitute values into the displayed formula.
- Estimate whether the answer should be larger or smaller than the starting values.
- Reveal the worked answer and compare every step, not only the final number.
20 practice questions
Try each fictional arithmetic question before opening its worked answer. Each item has a stable question ID and reporting link.
seo-iv-001Content 0.9.2.4-prelaunchReport this question
A fictional 1,000 mL volume is set over 8 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
1,000 ÷ 8 = 125 mL/hour
Mathematical result for this practice example: 125 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-002Content 0.9.2.4-prelaunchReport this question
A fictional 500 mL volume is set over 4 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
500 ÷ 4 = 125 mL/hour
Mathematical result for this practice example: 125 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-003Content 0.9.2.4-prelaunchReport this question
A fictional 250 mL volume is set over 2.5 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
250 ÷ 2.5 = 100 mL/hour
Mathematical result for this practice example: 100 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-004Content 0.9.2.4-prelaunchReport this question
A fictional 120 mL volume is set over 1.5 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
120 ÷ 1.5 = 80 mL/hour
Mathematical result for this practice example: 80 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-005Content 0.9.2.4-prelaunchReport this question
A fictional 600 mL volume is set over 5 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
600 ÷ 5 = 120 mL/hour
Mathematical result for this practice example: 120 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-006Content 0.9.2.4-prelaunchReport this question
A fictional 750 mL volume is set over 6 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
750 ÷ 6 = 125 mL/hour
Mathematical result for this practice example: 125 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-007Content 0.9.2.4-prelaunchReport this question
A fictional 100 mL volume is set over 30 minutes. What is the rate in mL/hour?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
30 minutes = 0.5 hours; 100 ÷ 0.5 = 200 mL/hour
Mathematical result for this practice example: 200 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-008Content 0.9.2.4-prelaunchReport this question
A fictional 300 mL volume is set over 3 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
300 ÷ 3 = 100 mL/hour
Mathematical result for this practice example: 100 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-009Content 0.9.2.4-prelaunchReport this question
A fictional 90 mL volume is set over 45 minutes. What is the rate in mL/hour?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
45 minutes = 0.75 hours; 90 ÷ 0.75 = 120 mL/hour
Mathematical result for this practice example: 120 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-010Content 0.9.2.4-prelaunchReport this question
A fictional 480 mL volume is set over 4 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
480 ÷ 4 = 120 mL/hour
Mathematical result for this practice example: 120 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-011Content 0.9.2.4-prelaunchReport this question
A fictional 1,000 mL volume is set over 12 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
1,000 ÷ 12 = 83.33 mL/hour
Mathematical result for this practice example: 83.33 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-012Content 0.9.2.4-prelaunchReport this question
A fictional 250 mL volume is set over 4 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
250 ÷ 4 = 62.5 mL/hour
Mathematical result for this practice example: 62.50 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-013Content 0.9.2.4-prelaunchReport this question
A fictional 150 mL volume is set over 2 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
150 ÷ 2 = 75 mL/hour
Mathematical result for this practice example: 75 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-014Content 0.9.2.4-prelaunchReport this question
A fictional 800 mL volume is set over 10 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
800 ÷ 10 = 80 mL/hour
Mathematical result for this practice example: 80 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-015Content 0.9.2.4-prelaunchReport this question
A fictional 360 mL volume is set over 3 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
360 ÷ 3 = 120 mL/hour
Mathematical result for this practice example: 120 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-016Content 0.9.2.4-prelaunchReport this question
A fictional 50 mL volume is set over 15 minutes. What is the rate in mL/hour?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
15 minutes = 0.25 hours; 50 ÷ 0.25 = 200 mL/hour
Mathematical result for this practice example: 200 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-017Content 0.9.2.4-prelaunchReport this question
A fictional 900 mL volume is set over 7.5 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
900 ÷ 7.5 = 120 mL/hour
Mathematical result for this practice example: 120 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-018Content 0.9.2.4-prelaunchReport this question
A fictional 125 mL volume is set over 1 hour. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
125 ÷ 1 = 125 mL/hour
Mathematical result for this practice example: 125 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-019Content 0.9.2.4-prelaunchReport this question
A fictional 200 mL volume is set over 1.6 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
200 ÷ 1.6 = 125 mL/hour
Mathematical result for this practice example: 125 mL/hour
Check the operation order, unit conversion and final unit before moving on.
seo-iv-020Content 0.9.2.4-prelaunchReport this question
A fictional 420 mL volume is set over 3.5 hours. What is the rate?
Show worked answer
Formula or method: rate = volume ÷ time in hours
Substitution and working:
420 ÷ 3.5 = 120 mL/hour
Mathematical result for this practice example: 120 mL/hour
Check the operation order, unit conversion and final unit before moving on.
Continue practising
Related learning
Content status and sources
This page is an original DosePractice public-beta learning resource. It remains subject to continuing educational, regulatory and editorial review; corrections are published when issues are identified.
- Nursing and Midwifery Council programme standards require health numeracy assessment related to medicine calculation, but DosePractice is not an NMC assessment or approved programme.
- Formula presentation should be independently reviewed against current tutor-approved or institutional teaching material before search indexing is enabled.
Review references
- NMC standards for pre-registration nursing programmes
- University of Southampton drug-calculation learning guide
- York St John University nursing formula sheet
Read the DosePractice content-review approach or report a problem.