Problems on Numbers
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Quantitative Aptitude - Problems on Numbers
Use properties of numbers, divisibility, remainder, and digit behavior to solve puzzles fast.
1. Typical Problem Types
- Digit-based puzzles (sum, reversal, formation conditions).
- Remainder and divisibility-use mod rules.
- Number formation from properties (odd/even, prime digits).
2. Key Techniques
- Use digit-sum and alternating-sum for divisibility tests.
- Extract value of digits using system of equations based on conditions given.
3. Quick Tips
- Translate statements into algebraic equations quickly.
- Use placeholders for digits-let hundred’s place = a, ten’s = b, unit’s = c.
- Use mod 3, mod 9, mod 11 quickly when remainders asked.
4. Revision Checklist
- Understand place value representation.
- Master remainder and divisibility rules.
- Practice digit-puzzle equations under time limit.
Summary: Convert wordy number puzzles into simple digit equations, use mod/rule shortcuts, and validate with options to solve accurately and quickly.
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