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

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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);

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