Wednesday, 22 April 2026

 

Number System – Hidden Tricks + Fast Methods

Master number system concepts with shortcut tricks and solve faster in exams.


🔥 Shortcut Tricks

  • Use divisibility rules (2,3,5,9,11)
  • Memorize squares & cubes
  • Use digital sum (casting out 9)
  • Focus on remainders

 Solve in 5 Seconds

Q1: Find remainder when 17 ÷ 5

Answer: 2


Q2: Is 12345 divisible by 3?

Shortcut: 1+2+3+4+5 = 15 ✔

Answer: Yes


 Exam Level Questions

Q3: Find remainder when 7²³ ÷ 5

Shortcut:
7 ≡ 2 (mod 5)
2²³ → cycle → remainder = 3


Q4: Find unit digit of 13²⁵

Shortcut:
3⁴ = 81 → cycle repeats
25 mod 4 = 1
Answer = 3


Q5: Find number of factors of 36

Solution:
36 = 2² × 3²
Factors = (2+1)(2+1) = 9


Q6: Find HCF of 24 and 36

Answer: 12


❌ Most Students Mistake

  • Ignoring cyclic patterns
  • Doing long division
  • Forgetting divisibility rules

 Speed Booster Tip

Always reduce numbers using modulo instead of solving fully.



Shaktimatha Learning
Quant • Number System • Bank Exam Preparation
Math Practice Study

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