Getting a number divisible by five with Math.Round

Question

I have a number variable that is between 0 and 100. It ccould be something like 83.333334.

I want to use Math.Round to round the number (e.g. Math.round(83.333334);). How can I do this so that the result is always divisible by five (i.e. in the set [0, 5, 10, 15... 85, 90, 95, 100])?

Answer 1

function roundDownToMultiple(number, multiple) {
    return number - (number % multiple);
}   

roundDownToMultiple(86, 5); // 85

roundDownToMultiple(89, 5); // 85

roundDownToMultiple(96, 5); // 95

Answer 2

Divide by 5, round it, multiply by 5.

alert(Math.round(83 / 5) * 5);

jsFiddle Demo

Answer 3

Using this Math.round(Math.floor(Math.random() * 100) / 5) * 5 You can get the Numbers divisible by 5.

• 100 - is the range of the Result.