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Here are some short tricks in mathematics that can help speed up calculations, especially in exams like SSC, banking, or entrance tests.


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🔢 Maths Short Tricks (With Examples)

1. Multiplying Two-Digit Numbers (Close to 100)

Trick:
If both numbers are near 100, subtract them from 100, multiply the differences, and subtract from 10000.

Example:
96 × 98
→ 100 - 96 = 4, 100 - 98 = 2
→ 4 × 2 = 8
→ 96 - 2 = 94
→ Answer = 9408 ✅


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2. Squaring Numbers Ending in 5

Trick:
Take the first digit(s), multiply it by the next number, and append 25.

Example:
25² → 2 × 3 = 6 → Add 25 → 625
65² → 6 × 7 = 42 → Add 25 → 4225


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3. Multiplying Any Number by 5

Trick:
Multiply the number by 10 and divide by 2.

Example:
86 × 5 → (86 × 10) ÷ 2 = 860 ÷ 2 = 430


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4. Divisibility Rules (Quick Check)

By 2: Last digit even

By 3: Sum of digits divisible by 3

By 4: Last two digits divisible by 4

By 5: Ends in 0 or 5

By 9: Sum of digits divisible by 9



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5. Addition of Consecutive Numbers

Formula:
Sum = n(n + 1)/2

Example:
Sum of 1 to 100 = 100 × 101 ÷ 2 = 5050


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6. Percentage Trick

Finding x% of y:
→ (x/100) × y

Shortcut: Interchange for easier calculation
12% of 50 = 50% of 12 = 6


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7. Multiplication of Numbers Ending in 1

Example:
91 × 91
= (90 + 1) × (90 + 1)
= 90² + 2×90×1 + 1²
= 8100 + 180 + 1 = 8281


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8. LCM × HCF = Product of Two Numbers

If you know LCM and HCF: a × b = LCM × HCF


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Would you like tricks for a specific topic (like percentages, algebra, square roots, etc.)? I can tailor them based on your needs.