How many milligrams are in 7 grams?

Correct Answer: A

Rationale: In this question, the correct answer is A) 7000 mg. To explain why this answer is correct, we need to understand the conversion factor between grams and milligrams. There are 1000 milligrams in 1 gram. So, to convert grams to milligrams, we multiply the number of grams by 1000. In this case, 7 grams x 1000 = 7000 mg. Now, let's analyze why the other options are incorrect: B) 7 mg: This option is incorrect because it is the same value as the given amount in grams, not the conversion to milligrams. C) 700 mg: This option is incorrect because it is one order of magnitude lower than the correct answer. It does not account for the conversion factor of 1000. D) 70 mg: This option is incorrect because it is two orders of magnitude lower than the correct answer. It also does not consider the conversion factor. Educationally, understanding basic unit conversions like grams to milligrams is essential in various fields, especially in science and healthcare. It is crucial for students to grasp these conversions to work accurately with measurements and quantities. By practicing such questions, students reinforce their understanding of these fundamental concepts and improve their quantitative reasoning skills.

Correct Answer: A

Rationale: To convert a fraction to a decimal, divide the numerator by the denominator. In this case, 3 divided by 4 is equal to 0.75. Therefore, the correct answer is A. Choices B, C, and D are incorrect because they do not represent the equivalent decimal value of 3/4. 0.5 is the decimal equivalent of 1/2, 0.65 is the decimal equivalent of 13/20, and 0.85 is the decimal equivalent of 17/20.

Correct Answer: B

Rationale: The correct answer is B: 3000 milliliters. There are 1,000 milliliters in a liter. Therefore, 3 liters = 3 1,000 = 3,000 milliliters. Choice A (300 milliliters) is incorrect as it represents the conversion of 0.3 liters, not 3 liters. Choice C (1500 milliliters) is incorrect as it is halfway between the correct answer and a common mistake of confusing liters with milliliters. Choice D (300 milliliters) is incorrect as it is the conversion of 0.3 liters, not 3 liters.

Correct Answer: D

Rationale: There are 32 ounces in a quart. Therefore, 3 quarts would be equal to 3 quarts x 32 ounces = 96 ounces. The correct answer is D. Choice A, 64 ounces, is incorrect as it miscalculates the conversion from quarts to ounces. Choice B, 32 ounces, is the conversion for 1 quart, not 3 quarts. Choice C, 48 ounces, is also an incorrect calculation, not considering the correct conversion rate.

Correct Answer: D

Rationale: The correct answer is D, 8 pounds. There are 16 ounces in a pound. To convert 128 ounces to pounds, you divide 128 by 16, which equals 8 pounds. Choice A, 16 pounds, is incorrect because that would be the conversion the other way around, from pounds to ounces. Choices B and C are incorrect as they do not reflect the correct conversion from ounces to pounds.