Question 1

How do I check divisibility?

Accepted Answer

Rules: Div by 2 if even, by 3 if digit sum div by 3, by 5 if ends in 0/5, by 9 if digit sum div by 9.

Question 2

Is 123 divisible by 3?

Accepted Answer

Sum digits: 1+2+3=6. Since 6÷3=2 (no remainder), 123 is divisible by 3. 123÷3=41.

Question 3

How accurate are these calculations?

Accepted Answer

Our calculator uses double-precision floating-point arithmetic, accurate to about 15-16 significant digits for most calculations.

Question 4

Can I use the result in further calculations?

Accepted Answer

Yes, results are calculated to full precision. You can copy the exact value or use the rounded display depending on your needs.

Divisibility Checker Calculator - Free Online

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