🧮 Q1: What is $25^2$?
- 1️⃣ 525
- 2️⃣ 575
- 3️⃣ 625
- 4️⃣ 675
✅ Correct Answer: 625
Trick: For any number ending in 5 → multiply the first digit by
next (2×3=6) and add 25 → 625.
✏️ Q2: What is $(53)^2$?
- 1️⃣ 2709
- 2️⃣ 2809
- 3️⃣ 2609
- 4️⃣ 2500
✅ Correct Answer: 2809
Trick: $(50 + 3)^2 = 50^2 + 2×50×3 + 3^2 = 2500 + 300 + 9 = 2809$
🔢 Q3: If $x + 1/x = 3$, find $x^2 + 1/x^2$.
- 1️⃣ 5
- 2️⃣ 7
- 3️⃣ 8
- 4️⃣ 9
✅ Correct Answer: 7
Trick: $(x + 1/x)^2 = x^2 + 1/x^2 + 2 → 9 = x^2 + 1/x^2 + 2 → x^2 + 1/x^2 = 7$
🧠 Q4: Simplify $99^2$ quickly.
- 1️⃣ 9700
- 2️⃣ 9801
- 3️⃣ 9900
- 4️⃣ 10000
✅ Correct Answer: 9801
Trick: $99^2 = (100 - 1)^2 = 10000 - 200 + 1 = 9801$