How does moving the decimal point three places to the left affect the value of a number in the metric system?
Decreases the value by a factor of 1000
Decreases the value by a factor of 100
Increases the value by a factor of 1000
No change in value
The Correct Answer is A
Rationale:
A. Decreases the value by a factor of 1000: Moving the decimal point three places to the left in the metric system reduces the number’s value by 1/1000 of its original amount. For example, 1000 mL becomes 1 L, reflecting a thousandfold decrease in magnitude.
B. Decreases the value by a factor of 100: Moving the decimal two places left, not three, would decrease the value by a factor of 100. Three places are required for a factor of 1000.
C. Increases the value by a factor of 1000: Moving the decimal to the left decreases the number, not increases it. Increasing the value by a factor of 1000 would require moving the decimal three places to the right.
D. No change in value: Shifting the decimal alters the numerical value according to the number of places moved. Moving it three places to the left significantly decreases the value, so there is indeed a change.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Rationale:
A. Double-checking all mathematical calculations: Verifying calculations is important to reduce errors, but it does not ensure the dose is clinically safe or appropriate for the patient’s condition.
B. Evaluating the final answer using clinical judgment: After completing dimensional analysis, the nurse must assess whether the calculated dose is reasonable for the patient’s age, weight, and clinical condition. This step ensures the dosage is both safe and therapeutically appropriate.
C. Using the correct conversion factors: Accurate conversion factors are essential for correct calculations, but correct math alone does not guarantee that the dose is safe or suitable for the specific patient.
D. Ensuring all units are canceled out correctly: Proper unit cancellation prevents mathematical errors, yet it does not evaluate whether the final dosage is safe or clinically appropriate for administration.
Correct Answer is D
Explanation
Calculation:
Amount = 0.005 g
Conversion:1 g = 1000 mg
Amount in mg = Amount in g × 1000
= 0.005 × 1000
= 5 mg
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