Correct Answer: B

Rationale:
To find 80% of a number, you multiply the number by 0.8.
Therefore, 80% of 55 is calculated as 0.8 55 = 44.
Choice A (40), choice C (39), and choice D (45) are incorrect as they do not represent the correct calculation for 80% of 55.

Correct Answer: A

Rationale:
To convert yards to inches, multiply the number of yards by 36 (since there are 36 inches in a yard). 1.5 yards 36 inches/yard = 54 inches.
Therefore, the correct answer is 54 inches.
Choice B, 60 inches, is incorrect as it incorrectly assumes that there are 40 inches in a yard.
Choice C, 72 inches, is incorrect as it multiplies 1.5 by 48, which is not the correct conversion factor.
Choice D, 84 inches, is incorrect as it multiplies 1.5 by 56, which is not the correct conversion factor.

Correct Answer: B

Rationale:
Rationale:
- Given that the table top has dimensions of 75cm by 50cm.
- Since opposite sides are equal, the table top can be divided into two pairs of equal sides: 75cm and 50cm.
-
To find the perimeter, we add up all four sides: 75cm + 50cm + 75cm + 50cm = 250cm.
- However, since opposite sides are equal, we only need to consider two sides: 75cm + 50cm = 125cm.
-
Therefore, the perimeter of the table top is 125cm + 125cm = 150cm.
- Hence, the correct answer is
B) 150cm.

Correct Answer: A

Rationale: 32 · (8\9) is the same as 32 (9\8) = 36.

Correct Answer: C

Rationale:
To convert 9/10 to a decimal, divide 9 by 10: 9 · 10 = 0.9. The correct answer is 0.9.
Choice A (0.7) is incorrect as 7/10 is equal to 0.7.
Choice B (0.8) is incorrect as 8/10 is equal to 0.8.
Choice D (1) is incorrect as 10/10 would be equal to 1.