20 Dose-to-Volume Practice Questions with Worked Answers
Build confidence with the arithmetic used to convert a required amount and a stock presentation into a volume. The page starts with straightforward ratios and gradually introduces decimal answers.
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
volume required = (dose required ÷ stock amount) × stock volume
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-dv-001Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 250 mg from stock containing 500 mg in 2 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
250 ÷ 500 × 2 = 1 mL
Mathematical result for this practice example: 1 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-002Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 75 mg from stock containing 150 mg in 3 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
75 ÷ 150 × 3 = 1.5 mL
Mathematical result for this practice example: 1.50 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-003Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 40 mg from stock containing 100 mg in 5 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
40 ÷ 100 × 5 = 2 mL
Mathematical result for this practice example: 2 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-004Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 30 mg from stock containing 60 mg in 2 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
30 ÷ 60 × 2 = 1 mL
Mathematical result for this practice example: 1 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-005Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 125 mg from stock containing 250 mg in 5 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
125 ÷ 250 × 5 = 2.5 mL
Mathematical result for this practice example: 2.50 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-006Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 90 mg from stock containing 120 mg in 4 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
90 ÷ 120 × 4 = 3 mL
Mathematical result for this practice example: 3 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-007Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 15 mg from stock containing 30 mg in 1 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
15 ÷ 30 × 1 = 0.5 mL
Mathematical result for this practice example: 0.50 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-008Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 60 mg from stock containing 80 mg in 2 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
60 ÷ 80 × 2 = 1.5 mL
Mathematical result for this practice example: 1.50 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-009Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 175 mg from stock containing 350 mg in 7 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
175 ÷ 350 × 7 = 3.5 mL
Mathematical result for this practice example: 3.50 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-010Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 45 mg from stock containing 90 mg in 6 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
45 ÷ 90 × 6 = 3 mL
Mathematical result for this practice example: 3 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-011Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 300 mg from stock containing 600 mg in 10 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
300 ÷ 600 × 10 = 5 mL
Mathematical result for this practice example: 5 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-012Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 25 mg from stock containing 100 mg in 8 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
25 ÷ 100 × 8 = 2 mL
Mathematical result for this practice example: 2 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-013Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 80 mg from stock containing 200 mg in 5 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
80 ÷ 200 × 5 = 2 mL
Mathematical result for this practice example: 2 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-014Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 12 mg from stock containing 24 mg in 2 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
12 ÷ 24 × 2 = 1 mL
Mathematical result for this practice example: 1 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-015Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 50 mg from stock containing 125 mg in 5 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
50 ÷ 125 × 5 = 2 mL
Mathematical result for this practice example: 2 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-016Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 225 mg from stock containing 450 mg in 4 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
225 ÷ 450 × 4 = 2 mL
Mathematical result for this practice example: 2 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-017Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 35 mg from stock containing 70 mg in 3 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
35 ÷ 70 × 3 = 1.5 mL
Mathematical result for this practice example: 1.50 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-018Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 160 mg from stock containing 400 mg in 10 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
160 ÷ 400 × 10 = 4 mL
Mathematical result for this practice example: 4 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-019Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 18 mg from stock containing 60 mg in 5 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
18 ÷ 60 × 5 = 1.5 mL
Mathematical result for this practice example: 1.50 mL
Check the operation order, unit conversion and final unit before moving on.
seo-dv-020Content 0.9.2.4-prelaunchReport this question
A fictional exercise asks for 140 mg from stock containing 280 mg in 2 mL. What volume is required?
Show worked answer
Formula or method: volume required = (dose required ÷ stock amount) × stock volume
Substitution and working:
140 ÷ 280 × 2 = 1 mL
Mathematical result for this practice example: 1 mL
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.