Set 1 – Similar Questions
Q1. Identify which of the following expressions are not equal to:
80 – 30 – 10
(a) 79 – 29 – 10
(b) 80 – (30 + 10)
(c) 80 – 31 – 9
(d) -30 + 80 + 10
Set 2 – Slightly Different Numbers (Same Type)
Q2. Identify the expression that is not equal to:
120 – 40 – 20
(a) 121 – 41 – 20
(b) 120 – (40 + 20)
(c) 120 – 41 – 19
(d) -40 + 120 + 20
Set 3 – Mixed Order Variants
Q3. Which of the following is not equal to:
75 – 20 – 15
(a) 75 – (20 + 15)
(b) 74 – 21 – 15
(c) -20 + 75 – 15
(d) 75 – 21 – 14
Set 4 – Same Pattern but Slightly Tricky
Q4. Identify the expression not equivalent to:
65 – 18 – 12
(a) 65 – (18 + 12)
(b) 66 – 19 – 12
(c) 65 – 19 – 11
(d) -18 + 65 – 10
Q1. Expression: 80 – 30 – 10
Compute original:
80 – 30 – 10 = 40
(a) 79 – 29 – 10 = 40 → Equal
(b) 80 – (30 + 10) = 80 – 40 = 40 → Equal
(c) 80 – 31 – 9 = 40 → Equal
(d) -30 + 80 + 10 = 60 → Not equal
✅ Answer: (d)
Q2. Expression: 120 – 40 – 20
Original:
120 – 40 – 20 = 60
(a) 121 – 41 – 20 = 60 → Equal
(b) 120 – (40 + 20) = 60 → Equal
(c) 120 – 41 – 19 = 60 → Equal
(d) -40 + 120 + 20 = 100 → Not equal
✅ Answer: (d)
Q3. Expression: 75 – 20 – 15
Original:
75 – 20 – 15 = 40
(a) 75 – (20 + 15) = 40 → Equal
(b) 74 – 21 – 15 = 38 → Not equal
(c) -20 + 75 – 15 = 40 → Equal
(d) 75 – 21 – 14 = 40 → Equal
✅ Answer: (b)
Q4. Expression: 65 – 18 – 12
Original:
65 – 18 – 12 = 35
(a) 65 – (18 + 12) = 35 → Equal
(b) 66 – 19 – 12 = 35 → Equal
(c) 65 – 19 – 11 = 35 → Equal
(d) -18 + 65 – 10 = 37 → Not Equal
✅ Answer: (d)