subtract 2 58 78 and reduce

HESI A2

HESI A2 Math Practice

1. Subtract 2 5\8 - 7\8 and reduce.

A. 1 & 5\8
B. 1 & 1\4
C. 1 & 6\8
D. 1 & 3\4

Correct answer: A

Rationale: Subtract the fractions first: 2 5\8 - 7\8 = 1 & 5\8.

2. A newborn weighs 3,459 grams. There are 453.59 grams per pound. What is the infant's weight in pounds and ounces?

A. 7 lbs 10 oz
B. 10 lbs 7 oz
C. 13 lbs 3 oz
D. 3 lbs 13 oz

Correct answer: A

Rationale: To find the weight in pounds, divide the weight in grams by the conversion factor (453.59 grams per pound). 3,459 grams ÷ 453.59 = approximately 7 lbs 10 oz. Therefore, choice A (7 lbs 10 oz) is the correct answer. Choice B (10 lbs 7 oz) and Choice C (13 lbs 3 oz) are incorrect as they do not correspond to the correct conversion. Choice D (3 lbs 13 oz) is incorrect as it does not account for the additional pounds derived from dividing 3,459 grams by the conversion factor.

3. Which number represents the number of protons in an element?

A. Atomic mass
B. Mass number
C. Atomic number
D. Proton number

Correct answer: C

Rationale: The correct answer is C: Atomic number. The atomic number corresponds to the number of protons in an element. Protons are positively charged subatomic particles found in the nucleus of an atom. Each element has a unique atomic number, which defines its identity based on the number of protons it contains. Choice A, Atomic mass, is incorrect as it refers to the average mass of an atom of an element. Choice B, Mass number, represents the total number of protons and neutrons in an atom's nucleus. Choice D, Proton number, is not a commonly used term in chemistry to indicate the number of protons.

4. Use the VERB correctly.

A. A pitchfork and a halter were left on the concrete floor.
B. There is a pig, sheep, and horse in the red trailer.
C. Here are the cages for the 2 rabbits and 2 chickens.
D. Sherri and her cousin were at the County fair this year.

Correct answer: D

Rationale: Choice D, 'Sherri and her cousin were at the County fair this year,' is the correct answer. 'Sherri and her cousin' is a compound subject, requiring the plural verb 'were' for proper subject-verb agreement. Choices A, B, and C contain subject-verb agreement errors. In Choice A, 'A pitchfork and a halter' is a compound subject and should be followed by the plural verb 'were.' In Choice B, 'a pig, sheep, and horse' is a list of items that should take the plural verb 'are.' Lastly, in Choice C, 'Here are' should be used instead of 'Here is' to match the plural subject 'the cages for the 2 rabbits and 2 chickens.'

5. How might the headrest on a car prevent traumatic injury?

A. By limiting hyperflexion of the neck
B. By limiting hyperextension of the neck
C. By reducing vertebral compression
D. By preventing disc degeneration

Correct answer: B

Rationale: The headrest on a car is designed to prevent traumatic injury by limiting hyperextension of the neck during a rear-end collision. This helps reduce the risk of whiplash and other neck injuries that may occur when the head is forcefully thrown backward. Choice A is incorrect because hyperflexion is not the primary concern in rear-end collisions. Choice C is incorrect as the headrest does not directly reduce vertebral compression. Choice D is incorrect because the headrest is not directly involved in preventing disc degeneration.