1Math.round(X);           // round X to an integer
2Math.round(10*X)/10;     // round X to tenths
3Math.round(100*X)/100;   // round X to hundredths
4Math.round(1000*X)/1000; // round X to thousandths

1var rounded = Math.round(number / 10) * 10

1Math.round(X);           // round X to an integer
2Math.round(10*X)/10;     // round X to tenths
3Math.round(100*X)/100;   // round X to hundredths
4Math.round(1000*X)/1000; // round X to thousandths
5...
6