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JavaScript Number Methods

The toPrecision() Method

The toPrecision() method returns a string, with a number written with a specified length:

let x = 9.656;
document.getElementById("demo").innerHTML = 
  x.toPrecision() + "<br>" +
  x.toPrecision(2) + "<br>" +
  x.toPrecision(4) + "<br>" +
  x.toPrecision(6);