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: C

Rationale: To solve for x, add 7 to both sides of the equation: 2x - 7 + 7 = 9 + 7. This simplifies to 2x = 16. Then, divide by 2 on both sides to get x = 8. This is the correct answer (C) because it correctly follows the principles of algebra. Choices A, B, and D are incorrect as they do not yield the correct solution when substituted back into the original equation.

Correct Answer: B

Rationale: To change 0.26 to a fraction, we need to look at the decimal place. 0.26 can be written as 26/100, which can be simplified to 13/50 by dividing both the numerator and denominator by 2. This is the correct answer because it is in simplest form. Choice A is incorrect as 7/8 is not equivalent to 0.26. Choice C is incorrect as 26/100 is the initial form of 0.26, not simplified. Choice D is incorrect as 1/3 is not the equivalent fraction for 0.26.

Correct Answer: B

Rationale: To convert 1/5 to a decimal, you divide 1 by 5. This gives you 0.2, which is the correct answer (B). Choice A (0.5) is the decimal equivalent of 1/2, not 1/5. Choice C (1.5) is the sum of 1 and 1/2. Choice D (0.15) is the decimal equivalent of 15/100, not 1/5. Therefore, the correct answer is B (0.2).

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.