diff --git a/src/eval/ops.rs b/src/eval/ops.rs
index 963c828bd..948243d12 100644
--- a/src/eval/ops.rs
+++ b/src/eval/ops.rs
@@ -171,29 +171,37 @@ pub fn mul(lhs: Value, rhs: Value) -> StrResult<Value> {
 
         (Length(a), Int(b)) => Length(a * b as f64),
         (Length(a), Float(b)) => Length(a * b),
+        (Length(a), Ratio(b)) => Length(a * b.get()),
         (Int(a), Length(b)) => Length(b * a as f64),
         (Float(a), Length(b)) => Length(b * a),
+        (Ratio(a), Length(b)) => Length(b * a.get()),
 
         (Angle(a), Int(b)) => Angle(a * b as f64),
         (Angle(a), Float(b)) => Angle(a * b),
+        (Angle(a), Ratio(b)) => Angle(a * b.get()),
         (Int(a), Angle(b)) => Angle(a as f64 * b),
         (Float(a), Angle(b)) => Angle(a * b),
+        (Ratio(a), Angle(b)) => Angle(a.get() * b),
 
         (Ratio(a), Ratio(b)) => Ratio(a * b),
         (Ratio(a), Int(b)) => Ratio(a * b as f64),
         (Ratio(a), Float(b)) => Ratio(a * b),
-        (Float(a), Ratio(b)) => Ratio(a * b),
         (Int(a), Ratio(b)) => Ratio(a as f64 * b),
+        (Float(a), Ratio(b)) => Ratio(a * b),
 
         (Relative(a), Int(b)) => Relative(a * b as f64),
         (Relative(a), Float(b)) => Relative(a * b),
+        (Relative(a), Ratio(b)) => Relative(a * b.get()),
         (Int(a), Relative(b)) => Relative(a as f64 * b),
         (Float(a), Relative(b)) => Relative(a * b),
+        (Ratio(a), Relative(b)) => Relative(a.get() * b),
 
-        (Float(a), Fraction(b)) => Fraction(a * b),
         (Fraction(a), Int(b)) => Fraction(a * b as f64),
         (Fraction(a), Float(b)) => Fraction(a * b),
+        (Fraction(a), Ratio(b)) => Fraction(a * b.get()),
         (Int(a), Fraction(b)) => Fraction(a as f64 * b),
+        (Float(a), Fraction(b)) => Fraction(a * b),
+        (Ratio(a), Fraction(b)) => Fraction(a.get() * b),
 
         (Str(a), Int(b)) => Str(a.repeat(b)?),
         (Int(a), Str(b)) => Str(b.repeat(a)?),