Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.2.5)
// ----

@function number($number) {
    @return $number / ($number * 0 + 1);
}

@function isInteger ($n) {
  @return round($n) == $n;
}

@function lcd($n1, $n2) {
  
  @if (isInteger($n2/$n1)) {
    $ln2: $n2/$n1;
    $ln1: $n1/$n1;
    
    @return #{$ln1}/#{$ln2};
  }
  
  @return #{$n1}/#{$n2};
  
  //$lcd: number($fraction);
  //@return $lcd;
}

.foo {
  lcd: lcd(4, 10);
  int: isInteger(4/11);
}

SassMeister-output.css

.foo {
  lcd: 4/10;
  int: false;
}