- Problem 47: To find n in the equation 8 × n = 128, divide both sides by 8. 128 ÷ 8 = 16. The correct answer is C.
- Problem 48: To find the missing number in 54 + □ = 71, subtract 54 from 71. 71 - 54 = 17. The correct answer is B.
- Problem 49: Evaluate (13 + 4) - (7 × 2). First, calculate inside parentheses: 13 + 4 = 17 and 7 × 2 = 14. Then subtract: 17 - 14 = 3. The correct answer is D.
- Problem 50: Substitute a = 3 into 15 - (a + 8). First, calculate inside parentheses: 3 + 8 = 11. Then subtract: 15 - 11 = 4. The correct answer is A.
- Problem 51: Evaluate (18 + 3) ÷ (3 - 2). First, calculate inside parentheses: 18 + 3 = 21 and 3 - 2 = 1. Then divide: 21 ÷ 1 = 21. The correct answer is D.
- Problem 52: Evaluate (16 ÷ 2) × (4 - 2) = x. First, calculate inside parentheses: 16 ÷ 2 = 8 and 4 - 2 = 2. Then multiply: 8 × 2 = 16. The correct answer is B.
Parent Tip: Review the logic above to help your child master the concept of 4th grade test.
