Correct Answer: A

Rationale: There are 1,000 milliliters in a liter.
To convert 2,500 milliliters to liters, you divide by 1,000: 2,500 milliliters / 1,000 = 2.5 liters.
Therefore, choice A, '2.5 liters,' is the correct answer.
Choice B, '25 liters,' is incorrect as it would be the result if you mistakenly multiplied instead of dividing.
Choice C, '250 liters,' is incorrect as it is 100 times the correct answer.
Choice D, '25,000 liters,' is significantly higher and not a conversion error but an order of magnitude error.

Correct Answer: D

Rationale:
To find the product of 15 and 52, you simply multiply them together: 15 x 52 = 780.
Therefore, the correct answer is 7.8.

Choices A, B, and C are incorrect as they represent fractions or decimals much smaller than the correct product of 780.

Correct Answer: B

Rationale: In the scale drawing, 1 inch represents 6 inches in reality. If the rocket is 6 inches tall on the drawing, the actual height of the rocket would be 6 inches x 6 = 36 inches, which is equal to 3 feet or 1 yard.
Therefore, the correct answer is 6 feet.
Choice A is incorrect because the actual height is more than 1 foot.
Choice C is incorrect as 36 inches is equivalent to 1 yard.
Choice D is incorrect because 36 inches is not equal to 2 yards.

Correct Answer: C

Rationale:
To divide mixed numbers, we first convert them to improper fractions. Converting 4â…› to an improper fraction gives us 33/8, and converting 1½ gives us 3/2. Dividing 33/8 by 3/2, we multiply the first fraction by the reciprocal of the second. This gives us (33/8) / (3/2) = (33/8) * (2/3) = 66/24 = 11/4, which simplifies to 2¾.
Therefore, the correct answer is 2¾.

Choices A, B, and D are incorrect as they do not represent the correct result of dividing 4â…› by 1½.

Correct Answer: D

Rationale:
To multiply 35 25, break it down into (30 + 5) 25. Now distribute: (30 25) + (5 25) = 750 + 125 = 875.
Therefore, 35 25 = 875.

Choices A, B, and C are incorrect because they do not represent the correct result of multiplying 35 by 25.
Choice A is 1000 times smaller than the correct answer,
Choice B is 100 times smaller, and
Choice C is 10 times smaller, making them all incorrect. The correct answer is
Choice D, 8.75.