All questions
Question 1
What is the value of 4+2[32−2(5−3)]?
- 14
- 16
- 20 (correct answer)
- 24
Explanation: Following order of operations: Start with the innermost parentheses: (5 - 3) = 2. Next, work outward: 2(2) = 4. Then evaluate the exponent: 3² = 9. Inside the brackets: 9 - 4 = 5. Next, multiply: 2[5] = 10. Finally: 4 + 10 = 20. Choice A results from incorrectly calculating 3² as 6. Choice B results from errors in handling the brackets. Choice D results from adding instead of subtracting within the brackets.
Question 2
If x=2 and y=3, what is the value of 2x2−3(x+y)+y18?
- 2
- 5 (correct answer)
- 8
- 11
Explanation: Following order of operations: First, substitute x = 2 and y = 3. Then evaluate exponents: 2(2)² = 2(4) = 8. Next, evaluate inside parentheses: (x + y) = (2 + 3) = 5. Then multiplication and division from left to right: 3(5) = 15 and 18/3 = 6. Finally, combine: 8 - 15 + 6 = 5. Choice A results from incorrectly calculating 2x² as 2(2) = 4. Choice C results from forgetting the subtraction sign. Choice D results from evaluating addition before multiplication.
Question 3
What is the value of 2+3⋅42−5⋅(6−4)÷2?
- 43
- 45
- 47 (correct answer)
- 49
Explanation: Following order of operations: First, evaluate parentheses: (6 - 4) = 2. Next, evaluate exponents: 4² = 16. Then, perform multiplication and division from left to right: 3 × 16 = 48, and 5 × 2 ÷ 2 = 5. Finally, perform addition and subtraction from left to right: 2 + 48 - 5 = 47. Choice A results from incorrectly calculating 3 × 4² as 3 × 4 × 2. Choice B results from calculation errors in the final step. Choice D results from not performing the final subtraction.
Question 4
What is the value of (−3)2⋅2−4⋅3+−6+224?
- 0 (correct answer)
- 6
- 12
- 18
Explanation: Following order of operations: First, evaluate exponents and operations in denominators: (-3)² = 9 and (-6 + 2) = -4. Next, perform multiplication and division: 9 × 2 = 18, 4 × 3 = 12, and 24 ÷ (-4) = -6. Finally, combine from left to right: 18 - 12 + (-6) = 6 - 6 = 0. Choice B results from forgetting the final addition of -6. Choice C results from incorrectly calculating the division as positive 6. Choice D results from not performing any subtraction.