| Course | NSG 298 Review of Nursing Concepts |
|---|---|
| Unit | Unit 3 |
| Paper type | Calculation error trace |
| Length | About 470 words, 4 pages |
| Format | APA 7 student paper |
| School | Herzing University |
| Program | BSN |
| Updated | October 2026 |
Free sample paper for NSG 298 Unit 3
Four Wrong Answers Left Untidied: A Calculation Error Trace Marking the Line Where Each One Failed, and What Kind of Failure It Was
Student Name
Department of Nursing, Herzing University
NSG 298: Review of Nursing Concepts
Instructor Name
January 29, 2026
Four Wrong Answers Left Untidied: A Calculation Error Trace Marking the Line Where Each One Failed, and What Kind of Failure It Was
How the Trace Is Laid Out
Four practice calculations I answered wrongly, each described in my own words. The left column shows the working exactly as I first wrote it, including where I stopped carrying units. The right column marks the line that failed, names the kind of failure, and gives the corrected line. Studies of nursing practice suggest that calculation errors in real care are hard to measure but do occur (Wright, 2010), so the purpose here is to find the kind of error I make, not to correct a single answer.
The Trace
Problems are numbered; lines within each are lettered.
| Problem and working as first written | Commentary |
|---|---|
| 1. Order 0.25 mg; tablets available in 125 mcg. (a) 0.25 mg = 25 mcg. (b) 25 ÷ 125 = 0.2 tablet. | Failure at (a): a conversion error. 0.25 mg is 250 mcg, since 1 mg = 1,000 mcg. I moved the decimal two places instead of three. Correct: 250 mcg ÷ 125 mcg per tablet = 2 tablets. A result of 0.2 tablet should have stopped me, since tablets are not given in fifths. |
| 2. Child weighs 44 lb; order 10 mg/kg per dose. (a) 44 × 2.2 = 96.8 kg. (b) 96.8 × 10 = 968 mg. | Failure at (a): the conversion was set up in the wrong direction. Pounds are divided by 2.2 to give kilograms. Correct: 44 ÷ 2.2 = 20 kg; 20 × 10 = 200 mg. A child of 97 kg, heavier than most adults, should have stopped me; I did not check the weight against the child. |
| 3. 500 mL to run over 4 hours by gravity; drop factor 15 gtt/mL. (a) 500 ÷ 4 = 125. (b) 125 × 15 = 1,875 gtt/min. | Failure at (b): a formula chosen for the wrong quantity. Line (a) gave mL per hour, and I then applied the drop factor as if (a) were mL per minute. Units stopped being carried at (a): I wrote 125 without "mL/h." Correct: 125 mL/h × 15 gtt/mL ÷ 60 min/h = 31 gtt/min. Carrying the unit would have shown that hours had not become minutes. |
| 4. Order 30 mg/kg/day divided every 8 hours; child 15 kg; suspension 250 mg per 5 mL. (a) 30 × 15 = 450 mg. (b) 450 × 5 ÷ 250 = 9 mL. | Failure at (b): the conversion was right but applied to the wrong quantity. Line (a) gave the daily dose; the question asked for each dose. Correct: 450 mg/day ÷ 3 doses = 150 mg per dose; 150 × 5 ÷ 250 = 3 mL. I carried "mg" but dropped "/day," which is the unit that would have told me to divide. |
Kinds of Failure Found
Two conversion errors (Problems 1 and 2), one in the size of the conversion and one in its direction. Two errors of applying a correct number to the wrong quantity (Problems 3 and 4), both at the point where I stopped writing units. No arithmetic errors: every multiplication and division was done correctly on the numbers I chose.
The pattern across all four is that I stop carrying units once a line looks familiar, and I do not check whether the answer makes sense for the patient: a fifth of a tablet, a 97 kg child, a drip of over 30 drops a second, a pediatric dose three times larger than it should be. Each of these would have been caught by a single question: could this be right for this patient?
Retesting the Pattern
To check whether the pattern holds, I worked ten new calculation items a week later, writing every unit on every line and adding a one-line reasonableness check under each answer. Nine were marked correct. The tenth was marked wrong on a rounding point: I rounded 2.25 mL to 2.3 by the course's rule, while the key showed 2.2; I have raised it with the instructor rather than counting it either way. The retest is small, but it suggests the change targets the right habit: none of the nine correct answers needed the reasonableness line to catch an error, because carrying units prevented the errors before they reached it.
What I Will Change
Every line will carry its full unit, including "per day," "per hour," and "per dose," until the final answer. Every answer will get a reasonableness check against the patient before I move on. Writing the leading zero and avoiding trailing zeros, as safe-practice guidance recommends, prevents a different class of tenfold error (Institute for Safe Medication Practices [ISMP], 2021), and I already do this; the errors above were not of that kind. The dimensional analysis method in the course pharmacology text carries units through each step for exactly this reason (Burchum & Rosenthal, 2022).
References
Burchum, J. R., & Rosenthal, L. D. (2022). Lehne's pharmacology for nursing care (11th ed.). Elsevier.
Institute for Safe Medication Practices. (2021). ISMP list of error-prone abbreviations, symbols, and dose designations. https://www.ismp.org/recommendations/error-prone-abbreviations-list
Wright, K. (2010). Do calculation errors by nurses cause medication errors in clinical practice? A literature review. Nurse Education Today, 30(1), 85-97. https://doi.org/10.1016/j.nedt.2009.06.009
What the NSG 298 Unit 3 instructions ask for
Unit 3 asks you to trace calculation errors to the exact line where they happened. Expect to present each wrong answer as you wrote it, mark the failing line, classify the type of failure, look for patterns, retest and say what you will change. Students often ask whether to correct the work first and how many problems to include. Leave the original work untidied so the error is visible. Classify failures, such as conversion, setup, arithmetic or dropped unit. A retest with new items checks whether the pattern holds. Changes should be habits, such as carrying units on every line. The value of the trace lies in locating the error, not in showing the right answer, so keep the corrected version separate from the original.
How this NSG 298 Unit 3 example is built
The trace opens with its layout and lettering. Four problems follow, each with the original lines, the failing line marked and a note on the type of failure. The conversion problems show a pound-to-kilogram error and a microgram-to-milligram error. The setup problem shows a dose placed on the wrong side of the ratio. The dropped-unit problem shows per day lost partway through. The pattern section counts failure types. The retest section reports ten new items and what changed. The final section names habits to adopt. Leaving the errors visible is the trace's main strength, since it shows exactly where reasoning slipped.
Where the points sit in the NSG 298 Unit 3 rubric
Herzing's rubric for a calculation error trace usually covers presentation of original work, identification of the failing line, classification of errors, pattern analysis, retesting and planned changes. Pinpointing the failing line carries the most weight, since locating the error is the skill the unit builds and the one that prevents repeats. Presentation points reward original work left exactly as written. Classification criteria look for clear types, such as conversion size, conversion direction, setup or dropped unit. Pattern earns credit when types are counted across problems rather than described one by one. Retest points go to new items worked with the new habit and scored honestly. Planned changes should be specific habits that a reader could check on the next worksheet. Units carried in the trace itself are expected. The ISMP list of error-prone abbreviations supports the unit rule.
NSG 298 Unit 3 help: mistakes that cost points
Error traces in Unit 3 commonly lose points by correcting the work before analyzing it, which hides the failure. Another frequent problem is naming the wrong answer without the line where it went wrong. Students often classify every error as careless, which teaches nothing about how to prevent the next one. Retesting is skipped, so the proposed fix is never checked. Changes are vague, such as be more careful. Units are dropped in the trace itself. Patterns are not counted. Reasonableness checks, such as asking whether 15 tablets makes sense, are not added to the plan. The retest uses the same problems rather than new ones. Finally, mark the line, because graders reward a trace that shows exactly where reasoning slipped and what habit would have caught it.
Get a NSG 298 Unit 3 example written to your instructions
Send the Unit 3 instructions and the rubric from your NSG 298 classroom, with the practice problems and the working you actually submitted. We write a custom example that keeps the original arithmetic intact, carries units on every line, marks the failing step and names the error type. First custom sample free, back in 24 to 48 hours.
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NSG 298 Unit 3 questions, answered
Should I send my wrong working or just the problems?
Send both if you can. The working is what the trace is about, and a problem without an attempt only demonstrates that the arithmetic can be done correctly, which the unit already assumes. Where you no longer have the original, describe what you remember doing and the example marks that as a reconstruction rather than presenting it as the first attempt.
Does the trace say what dose should have been given?
It reports what the practice problem asked for and what the arithmetic yields, and it stops there. Nothing in the document is a recommendation about a person, and no figure in it should be read as one. Administration decisions belong to licensed staff working from an order and a current record, none of which a coursework example holds or models.
Which rounding convention should the trace use?
The one your course materials name, and the trace should say which it followed. Conventions differ between texts and settings, and a solution marked wrong for rounding is a different finding from one marked wrong for a conversion. If your instructions are silent, state your convention in a line at the top and apply it identically to every problem.
Where can I find a free NSG 298 Unit 3 sample paper?
The full NSG 298 Unit 3 calculation error trace is free on this page, four wrong answers with the failing line marked and a retest. Your own missed calculations can be traced the same way on request.
How do I stop making dosage calculation errors?
Find the exact line where each error happened, classify it and change one habit, such as writing the full unit on every line. This sample traced four errors and found the dropped-unit error gone after that change.