How to round an integer up or down to the nearest 10 using Javascript

Divide the number by 10, round the result and multiply it with 10 again, for example:

1. 33 / 10 = 3.3
2. 3.3 rounded = 3
3. 3 × 10 = 30

console.log(Math.round(prompt('Enter a number', 33) / 10) * 10);