What is the equivalent of 0.3 mg in mcg?

Correct Answer: A

Rationale: To convert milligrams (mg) to micrograms (mcg), you need to multiply by 1000 since 1 mg is equal to 1000 mcg. Therefore, 0.3 mg x 1000 = 300 mcg. This conversion is crucial in healthcare to ensure accurate medication dosages. Choice B (30 mcg) is incorrect as it represents the conversion of 0.03 mg to mcg. Choice C (3000 mcg) is incorrect as it is the result of multiplying 0.3 mg by 10 instead of 1000. Choice D (3 mcg) is incorrect as it is the result of not multiplying by 1000 to convert milligrams to micrograms.

Correct Answer: A

Rationale: In this question, the correct answer is A) 500 milliliters. To understand this, we need to apply the concept of metric conversions. In the metric system, there are 1000 milliliters in 1 liter. So, to convert liters to milliliters, we need to multiply the given number of liters by 1000. Therefore, to convert 0.5 liters to milliliters, we multiply 0.5 by 1000 which equals 500 milliliters. This conversion is essential in various fields such as science, medicine, and everyday measurements. Now, let's analyze why the other options are incorrect: B) 50 milliliters - This is incorrect because it does not account for the correct conversion factor of 1000 milliliters in 1 liter. C) 5 milliliters - This option is incorrect as it only represents a fraction of the correct conversion. D) 0.5 milliliters - This is incorrect as it directly equates liters to milliliters without applying the correct conversion factor. Understanding metric conversions is crucial in fields where precise measurements are required. It is fundamental for students to grasp these conversions to ensure accuracy in calculations and to facilitate effective communication in various scientific and medical contexts.

Correct Answer: A

Rationale: To convert liters to milliliters, you multiply the number of liters by 1000. Therefore, 0.5 liters equals 500 milliliters. This conversion is standard in various fields, making choice A the correct answer. Choices B, C, and D are incorrect because they do not correctly convert liters to milliliters.

Correct Answer: A

Rationale: The correct answer is A: 500 ml. To convert liters to milliliters, you multiply the number of liters by 1000 because 1 liter is equal to 1000 milliliters. Therefore, 0.5 liters x 1000 = 500 milliliters. Choices B, C, and D are incorrect because they do not correctly convert 0.5 liters to milliliters based on the conversion factor of 1000 ml per liter.

Correct Answer: A

Rationale: To find the product of 0.5 and 20, you multiply them together. 0.5 x 20 = 10. This calculation involves multiplying a decimal (0.5) by a whole number (20). Choice A, '10', is the correct answer. Choice B, '15', is incorrect as it does not accurately represent the result of multiplying 0.5 by 20. Choices C and D, '20' and '25', are also incorrect as they do not reflect the correct calculation. This question assesses your ability to perform basic arithmetic operations involving decimals and whole numbers.