What is 91 mod 7?

How to compute 91 mod 7?

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 / 7 = 13
2. ⌊13⌋ = 13 (We only keep the integer part)
3. 7 × 13 = 91
4. 91 - 91 = 0 (Subtracting gives us the remainder)

In short: 91 − (7 × ⌊91 / 7⌋) = 0

Is 91 divisible by 7?

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 7 is 0, this indicates that dividing 91 by 7 leaves no remainder. Therefore, yes, 91 is indeed divisible by 7.