Correct Answer: B

Rationale:
To convert a decimal to a fraction, we note that 1.25 can be expressed as 1 + 0.25. Since 0.25 is equivalent to 25/100 or 1/4, we add 1 whole to 1/4 to get 1 1/4, which simplifies to 5/4.
Therefore, 1.25 as a fraction is 5/4.
Choice A (1 1/4) is the mixed number form of 5/4.
Choice C (4/5) and
Choice D (25/20) are incorrect fractions that do not represent 1.25.

Correct Answer: B

Rationale:
To find the volume of a cube, you cube the length of one side. In this case, the side length is 3 cm, so the volume is calculated as 3 cm * 3 cm * 3 cm = 27 cm³.
Therefore, the correct answer is 27 cm³.
Choice A (9 cm³),
Choice C (18 cm³), and
Choice D (12 cm³) are incorrect as they do not correctly calculate the volume of a cube with a side length of 3 cm.

Correct Answer: D

Rationale:
To find the perimeter of a rectangle, you add the lengths of all its sides. In this case, the formula for the perimeter of a rectangle is 2*(length + width). Substituting the given values, we get: 2*(7 cm + 3 cm) = 2*(10 cm) = 20 cm.
Therefore, the correct answer is 20 cm.
Choice A (21 cm) is incorrect because it is the sum of the individual sides rather than the perimeter.
Choice B (10 cm) is incorrect because it only represents one side of the rectangle.
Choice C (14 cm) is incorrect as it is not the total perimeter of the rectangle.

Correct Answer: A

Rationale:
To find out how much paint Shawna uses on the first day, calculate 2/5 * 5 = 2 gallons. Subtracting the amount used from the total amount gives us 5 - 2 = 3 gallons remaining.
Therefore, Shawna has 3 gallons of paint left after using 2 gallons on the first day.
Choice A is correct.

Choices B, C, and D are incorrect because she has more paint left than the options presented.

Correct Answer: A

Rationale: The correct answer is 'Multiplication.' In the expression 8 + 5 * 3, according to the order of operations (PEMDAS), multiplication should be done before addition. PEMDAS stands for Parentheses, Exponents, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).
Therefore, the multiplication operation should be completed first, making 5 * 3 equal to 15, and then the addition operation should be conducted to get the final result of 8 + 15, which equals 23.

Choices B, C, and D are incorrect because in this expression, multiplication takes precedence over addition, division, and subtraction according to the order of operations.