Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v2.0.0)
// ----

@mixin equivalent_fractions($numerator,$denominator){
    @for $i from -$numerator through -1{
        @if($numerator % abs($i) == 0 and $denominator % abs($i) == 0){
            numerator: $numerator;
            increment: abs($i);
            out: #{$numerator % abs($i)}-#{$denominator % abs($i)};
        }
    }
}

.test{
    @include equivalent_fractions(12,24);
}

SassMeister-output.css

.test {
  numerator: 12;
  increment: 12;
  out: 0-0;
  numerator: 12;
  increment: 6;
  out: 0-0;
  numerator: 12;
  increment: 4;
  out: 0-0;
  numerator: 12;
  increment: 3;
  out: 0-0;
  numerator: 12;
  increment: 2;
  out: 0-0;
  numerator: 12;
  increment: 1;
  out: 0-0; }