✅ Divisibility Test Calculator
Check if a number is divisible by common divisors
How to Use This Calculator
Enter a Number
Type any integer to test divisibility by 2-11.
Click Test
Press the button to check divisibility by all common divisors.
View Results
See which divisors work with ✓ and which don't with ✗.
Divisibility Rules
Divisible by 2:
Last digit is even (0,2,4,6,8)
Divisible by 3:
Sum of digits divisible by 3
Divisible by 4:
Last 2 digits divisible by 4
Divisible by 5:
Last digit 0 or 5
Divisible by 6:
Divisible by both 2 and 3
Divisible by 7:
Complex alternating sum rule
Divisible by 8:
Last 3 digits divisible by 8
Divisible by 9:
Sum of digits divisible by 9
Divisible by 10:
Last digit is 0
Divisible by 11:
Alternating sum divisible by 11
About Divisibility Test Calculator
The Divisibility Test Calculator checks if a number is divisible by common divisors (2-11) using mathematical rules. No need for long division!
When to Use This Calculator
- Math Problems: Check divisibility quickly
- Factors: Find what a number is divisible by
- Fractions: Determine if fractions can be simplified
- Education: Learn divisibility rules
Why Use Our Calculator?
- ✅ All Rules: Tests divisibility by 2-11
- ✅ Visual Results: Clear ✓ or ✗ for each divisor
- ✅ Instant: No long division needed
- ✅ Educational: See all rules
- ✅ Completely Free: No registration required
Frequently Asked Questions
How do you check if a number is divisible by 3?
Sum all digits. If the sum is divisible by 3, the number is too. Example: 123 → 1+2+3=6, and 6 is divisible by 3, so 123 is divisible by 3.
What's the divisibility rule for 7?
Take the last digit, double it, subtract from remaining digits. If result divisible by 7, original is too. This calculator uses the complex alternating method.
Why are there rules for divisibility?
Rules save time! Instead of doing long division, use quick checks to determine if a number is divisible. Essential for finding factors and simplifying fractions.