Generated by SassMeister.com.

SassMeister-input-HTML.html

<div class="m45">m45: 90px tall</div>
<div class="m50">m50: 100px tall</div>
<div class="m55">m55: 110px tall</div>

SassMeister-input.scss

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

@for $i from 1 through 10 {
  .m#{$i*5} {
    height: $i*10px;
  }
}

SassMeister-output.css

.m5 {
  height: 10px;
}

.m10 {
  height: 20px;
}

.m15 {
  height: 30px;
}

.m20 {
  height: 40px;
}

.m25 {
  height: 50px;
}

.m30 {
  height: 60px;
}

.m35 {
  height: 70px;
}

.m40 {
  height: 80px;
}

.m45 {
  height: 90px;
}

.m50 {
  height: 100px;
}

SassMeister-rendered.html

<div class="m45">m45: 90px tall</div>
<div class="m50">m50: 100px tall</div>
<div class="m55">m55: 110px tall</div>