Javascript: Find Closest Number

i would like to find rounded nearest number in javascript e.g. 10 --> 10 11 --> 10 12 --> 10 13 --> 15 16 --> 15 17 --> 15 18 --> 20 19 --> 20 20 --> 20

Solution 1:

var multipleOfFive = Math.round(yourNumber / 5) * 5;