Bank Exam Accuracy Booster + Shortcut Formulas – Page 19

Derived Tricks • Fast Calculation • Zero Mistake Strategy

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🔥 1. Percentage Shortcuts (Derived)

Basic Idea: % = fraction

• 25% = 1/4 → Divide by 4
• 50% = 1/2 → Divide by 2
• 75% = 3/4 → (Divide by 4 × 3)
• 10% = Divide by 10
• 1% = Divide by 100

Example: 25% of 800 = 800 ÷ 4 = 200

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🔥 2. Multiplication Shortcuts

(a) 125 × n

125 = 1000 / 8

⇒ 125 × n = (n ÷ 8) × 1000

Example: 125 × 32 = (32 ÷ 8) × 1000 = 4 × 1000 = 4000

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(b) 25 × n

25 = 100 / 4

⇒ 25 × n = (n ÷ 4) × 100

Example: 25 × 48 = (48 ÷ 4) × 100 = 12 × 100 = 1200

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(c) 99 × n

99 = 100 − 1

⇒ 99 × n = (100n − n)

Example: 99 × 84 = 8400 − 84 = 8316

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(d) 999 × n

999 = 1000 − 1

⇒ 999 × n = (1000n − n)

Example: 999 × 72 = 72000 − 72 = 71928

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🔥 3. Square Tricks (Near Base)

(a) (x + a)² = x² + 2ax + a²

Example: 52²

= (50+2)² = 2500 + 200 + 4 = 2704

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(b) (x − a)² = x² − 2ax + a²

Example: 48²

= (50−2)² = 2500 − 200 + 4 = 2304

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🔥 4. Time & Work Shortcut

If A = a days, B = b days

Formula:

Together = (a × b) / (a + b)

Example: A=6, B=12

= (6×12)/(6+12) = 72/18 = 4 days

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🔥 5. Ratio to Percentage Trick

a : b

⇒ a/(a+b) × 100

Example: 2:3

= 2/5 ×100 = 40%

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🔥 6. Number Series Speed Logic

• ×2, ×3 → multiplication pattern
• +1, +2 → addition pattern
• Alternate pattern
• Square/Cube pattern

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🔥 7. Accuracy Booster Rules

• Read question twice
• Avoid assumption
• Check units carefully
• Eliminate wrong options

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🔥 Topper Golden Formula

Speed + Accuracy + Practice = Selection

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Final Motivation

Learn Smart → Solve Fast → Score High → Get Selected