Metric Conversions for Nursing

Correct Answer: B

Rationale: To convert 0.1 liter to milliliters, you need to know that 1 liter is equal to 1000 milliliters. So, to convert 0.1 liter, you multiply 0.1 by 1000, which equals 100 milliliters. Therefore, the correct answer is B: 100 ml. Choice A (10 ml) is incorrect because it doesn't consider the conversion factor between liters and milliliters. Choice C (1000 ml) is incorrect as it represents 1 liter, not 0.1 liter. Choice D (1 ml) is incorrect as it is too small of a value for 0.1 liter.

Correct Answer: B

Rationale: To convert millimeters to meters, we divide by 1000 since there are 1000 millimeters in a meter. Therefore, 3.54 mm in meters is 3.54/1000 = 0.00354 meters. Choice B is correct as it correctly converts 3.54 mm to meters. Choices A, C, and D are incorrect because they do not apply the correct conversion factor. Choice A incorrectly moves the decimal point two places to the left instead of three. Choice C incorrectly multiplies by 10 instead of dividing by 1000. Choice D incorrectly moves the decimal point one place to the left instead of three.

Correct Answer: A

Rationale: To convert mg to ml, we need to know the density of the substance. Assuming water density, 1 mg = 1 ml. Therefore, 0.3 mg is equivalent to 0.3 ml. Other choices are incorrect because they do not correspond to the correct conversion factor or are off by a factor of 10.

Correct Answer: A

Rationale: To express 0.004 as a ratio, we need to convert it to a fraction. 0.004 = 4/1000 = 1/250. Therefore, the correct ratio is 1:250. Choice B (4:20) simplifies to 1:5, not equivalent to 1:250. Choice C (2:40) simplifies to 1:20, also incorrect. Choice D (9:20) does not represent the decimal value 0.004. Hence, the correct answer is A.

Correct Answer: A

Rationale: To convert liters to milliliters, you multiply by 1000 since 1 liter is equal to 1000 milliliters. Therefore, 0.5 liters is equal to 0.5 x 1000 = 500 ml. Choice A (500 ml) is correct. Choices B, C, and D are incorrect because they do not follow the correct conversion factor of 1 liter to 1000 milliliters. B (50 ml), C (5 ml), and D (0.5 ml) are not the correct conversions for 0.5 liters.