Number

percentage($number) Converts a unitless number to a percentage.
round($number) Rounds a number to the nearest whole number.
ceil($number) Rounds a number up to the next whole number.
floor($number) Rounds a number down to the previous whole number.
abs($number) Returns the absolute value of a number.
min($numbers…) Finds the minimum of several numbers.
max($numbers…) Finds the maximum of several numbers.
random([$limit]) Returns a random number.
You may use + to add a unit at the end of a number.
div {
   width: percentage(max(random(100),random(100))/100);
}

div {
  width: 48%;
}