Learning Trick

Divisibility Rules
  • September 21, 2025
  • 0 Comments
  • Charles Daniel

Divisibility by 3

2+7+1=10 ⇒271 not divisible by 32+7+1=10\ ⇒271\ not\ divisible\ by\ 3Sum of digits divisible by 3.
Example:

2+7+1=10 ⇒271 not divisible by 3

2+ 4  +3 = 9 ⇒243 divisible by 3

Note: Always works

n ≡ sum of digits (mod 3)n\ ≡\ sum\ of\ digits\ (mod\ 3)

Tags: Division Rules Mod 3


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