How to round a number to its nearest 10's place? Example if number = 123, then it should be rounded to 100, if it is 175 that is greater than 150 then it should round to 200 , the number will changed ?

How to round a number to its nearest 10's place? Example if number = 123, then it should be rounded to 100, if it is 175 that is greater than 150 then it should round to 200 , the number will changed ?

• javascript

• possible duplicate of How to round an integer up or down to the nearest 10 using Javascript – Sadikhasan Commented Feb 27, 2015 at 9:06

7 Answers 7

You can use Math.round() for that. Math.round() rounds of the decimals. In order to get decimals in this case we need to divide a with 100 (155/100 = 1.55). Now the Math.round() will round this number to 2. We can now multiply this number with 100 again to get the correct number. Try this:

var number = 155;
var rounded = Math.round( number / 100 ) * 100;

this is how I would do it,

function round10(num){
    var tmp=1;
    while(num>10){
        num = Math.round(num/10);
        tmp*=10;
    }

    return num*tmp;
}

<script>
var num=230;
num=((num/100).toFixed(0))*100;
</script>

try this var num = 175; alert(Math.round(num/100)*100);

Divide the number by 100 and round it. Then, multiply by 100.

num = Math.round(num / 100) * 100;

In dart you can:

var number = 143;
var result = (number / 100).round() * 100

value = 2345;
 log_10 =  parseInt(Math.log(value) / Math.log(10));
                      basePower =  Math.pow(10, log_10); 
                      result = ((((value/basePower)).toFixed(0))* basePower); 
                      alert(result);