HESI A2 Practice Test Math

Correct Answer: A

Rationale: Failed to generate a rationale after 5 retries.

Correct Answer: A

Rationale: The correct answer is A: 55 mg/dL. To convert from mmol/L to mg/dL for glucose, you multiply by 18. Therefore, 5.5 mmol/L x 18 = 99 mg/dL. However, blood glucose levels are commonly approximated by dividing by 2, so 99 mg/dL ≈ 50 mg/dL. Therefore, the closest option is A: 55 mg/dL. Option B (5.5 mg/dL) is incorrect as it does not account for the conversion factor of 18. Option C (0.55 mg/dL) is incorrect as it is a decimal point off from the correct answer. Option D (550 mg/dL) is incorrect as it is a factor of 10 too high.

Correct Answer: B

Rationale: To find the number of boys, we first calculate 44% of 25 (total students). This gives us 0.44 * 25 = 11 boys. Therefore, the correct answer is B. Choice A (10 boys) is incorrect as it is based on rounding down from 44%, and choices C (9 boys) and D (13 boys) are incorrect as they do not match the calculated 11 boys.

Correct Answer: C

Rationale: To calculate the number of mils in 1.5 grams, we first convert 1.5 grams to milligrams: 1.5g * 1000mg/g = 1500mg. Then, we divide 1500mg by the amount in 1 mil (500mg/mil) to get 3 mils. Choice C is correct. Choices A, B, and D are incorrect because they do not follow the correct conversion process. Choice A (9 mils) results from dividing 1500mg by 500mg, which is incorrect. Choice B (2 mils) and Choice D (5 mils) also do not yield the correct answer when dividing 1500mg by 500mg.

Correct Answer: C

Rationale: To add 2/3 and 4/9, find a common denominator which is 9. Then, convert 2/3 to 6/9. Now, add 6/9 + 4/9 = 10/9. Therefore, the correct answer is C (10/9). Option A (8/15) and D (1/2) are incorrect as they do not result from adding 2/3 and 4/9. Option B (1) is incorrect as the sum is not equal to 1.