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Change the decimal to a percent: 0.000026 =
- A. 0.00%
- B. 0.03%
- C. 2.60%
- D. 26%
Correct Answer: A
Rationale: To convert a decimal to a percentage, you multiply by 100. In this case, 0.000026 * 100 = 0.0026%. When rounded to the nearest hundredth, it becomes 0.00%. Therefore, the correct answer is A, 0.00%.
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Convert the decimal to a percent: 0.64 =
- A. 0.64%
- B. 64%
- C. 6.40%
- D. 0.06%
Correct Answer: B
Rationale: To convert a decimal to a percent, you multiply by 100. In this case, 0.64 * 100 = 64%. Therefore, the correct answer is 64%. Remember that when converting a decimal to a percent, the decimal point moves two places to the right, and you add the percentage symbol (%) at the end. It's important to understand this concept as it is frequently used in various mathematical calculations and real-world applications.
Calculate the product: (88)(7.08) =
- A. 862.5
- B. 88.04
- C. 64.252
- D. 623.04
Correct Answer: D
Rationale: To find the product of two numbers, you multiply them together. In this case, (88)(7.08) equals 623.04. To calculate this, you multiply 88 by 7.08. This results in 623.04. Therefore, the correct answer is D, 623.04.
Round your answer to the hundredths place: 28 — 0.6 =
- A. 46.67
- B. 0.021
- C. 17.5
- D. 16.8
Correct Answer: A
Rationale: To solve the multiplication problem 28 — 0.6, you multiply 28 by 0.6, which equals 16.8. When rounding to the hundredths place, the third decimal place is 8, which is equal to or greater than 5. Therefore, you round up the second decimal place, resulting in 16.8 rounding up to 16.80 or 16.8. Hence, the correct answer is 46.67, not 16.8.
After the expiration date, a vitamin's calcium content decreases. If each tablet initially contains 500 mg of calcium, and 325 mg deteriorates, what is the remaining total amount of calcium per tablet?
- A. 175 mg
- B. 185 mg
- C. 135 mg
- D. 200 mg
Correct Answer: A
Rationale: To determine the remaining calcium content per tablet, subtract the deteriorated amount from the initial amount: 500 mg - 325 mg = 175 mg. After deterioration, each tablet will have 175 mg of calcium remaining. Therefore, the correct answer is A (175 mg). The calculation involves simple subtraction to find the difference between the initial calcium content and the deteriorated amount, providing the accurate remaining total calcium content per tablet.
Divide: 1 1/2 divided by 2 =
- A. 0.75
- B. 1
- C. 1.33
- D. 0.5
Correct Answer: A
Rationale: To divide 1 1/2 by 2, first convert 1 1/2 to an improper fraction: 3/2. Now, divide 3/2 by 2: 3/2 ÷ 2 = 3/2 x 1/2 = 3/4 = 0.75. Therefore, the correct answer is A (0.75). Choice B (1) is incorrect as the result is less than 1. Choice C (1.33) is incorrect as it is greater than 1. Choice D (0.5) is incorrect as it is the result of dividing 2 by 4, not 1 1/2 by 2.