Math HESI A2 Practice Test

Correct Answer: A

Rationale: To convert grams to milligrams, you multiply by 1000 since there are 1000 milligrams in a gram. So, 7 grams x 1000 = 7000 mg. Therefore, the correct answer is A: 7000 mg. Option B (7 mg) is incorrect because it represents the original unit (grams). Option C (700 mg) is incorrect as it is a partial conversion error. Option D (70 mg) is incorrect as it is a multiple of 10 error.

Correct Answer: D

Rationale: To convert kilograms to grams, we need to multiply by 1000 since there are 1000 grams in a kilogram. So, 8 kilograms x 1000 = 8000 grams. Therefore, the correct answer is D: 8000 grams. Choice A (80000 grams) is incorrect as it incorrectly multiplies by 100 instead of 1000. Choice B (800 grams) is incorrect as it is the result if we ignore the conversion factor. Choice C (80000 grams) is a duplication of choice A.

Correct Answer: B

Rationale: To convert liters to milliliters, you need to multiply by 1000. Therefore, to find how many milliliters are in 6 liters, you would multiply 6 by 1000, which equals 6000 milliliters. Choice A (60 milliliters) is incorrect as it is 100 times less than the correct answer. Choice C (600 milliliters) is incorrect as it is 10 times less than the correct answer. Choice D (0.6 milliliters) is incorrect as it is a decimal and represents a fraction of the milliliters in 6 liters.

Correct Answer: D

Rationale: To find 50% of 120, you multiply 120 by 0.50 (which represents 50%). So, 120 x 0.50 = 60. Therefore, the correct answer is D. Choice A (50) is incorrect because it represents the percentage value, not the result of the calculation. Choice B (50) is a duplicate of Choice A. Choice C (70) is incorrect as it is not the result of finding 50% of 120.

Correct Answer: C

Rationale: To calculate the total milligrams administered in 3 hours, we first find the total drops delivered in 3 hours: 40 drops/min * 180 min = 7,200 drops. Then, we convert drops to milligrams: 7,200 drops * 1mg/drop = 7,200mg. Therefore, the correct answer is C (7,200mg). Choice A (360mg) is incorrect because it doesn't account for the duration of 3 hours. Choice B (720mg) is incorrect as it doesn't consider the total drops delivered. Choice D (14,400mg) is incorrect because it overestimates the amount by assuming each drop is administered separately, which is not the case in a continuous IV drip.