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Rounding

If you want to round a number, you can use the Math.round(), Math.floor() and Math.ceil() functions. 
let a = Math.round(5.49);
let b = Math.round(4.5);
let c = Math.floor(5.99);
let d = Math.ceil(4.01);
Math.round() rounds a number to the nearest integer, Math.floor() rounds a number downwards to the nearest integer and Math.ceil() rounds a number upwards to the nearest integer. Therefore, the variables a to d all get the value 5.

Exercise

Write a function round100 that rounds a number to the nearest hundred.

Example: round100(1749) should return 1700 and round100(856.12) should return 900.
In addition to Math.round(), use multiplication and division.
function round100(x) {
  return Math.round(x / 100) * 100;
}

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