What is 91 mod 3?

How to compute 91 mod 3?

The simplest approach is to use the "mod" operator (often denoted as "%" in many programming languages), but you could do it manually in the following way:

$\mathrm{Remainder}=N-(M\times \lfloor \frac{N}{M}\rfloor )$

(where N is the dividend, M is the divisor and $\lfloor \frac{N}{M}\rfloor$ represents the integer part of the quotient)

1. 91 / 3 = 30.333333333333
2. ⌊30.333333333333⌋ = 30 (We only keep the integer part)
3. 3 × 30 = 90
4. 91 - 90 = 1 (Subtracting gives us the remainder)

In short: 91 − (3 × ⌊91 / 3⌋) = 1

Is 91 divisible by 3?

A number is said to be divisible by another number, if the remainder of the division is zero.

Given that the result of 91 mod 3 is 1, this indicates that dividing 91 by 3 leaves a remainder of 1. Therefore, no, since the remainder isn't zero, 91 is not divisible by 3.