diff --git a/fixit/convert.py b/fixit/convert.py
index 845b8ba..400b081 100644
--- a/fixit/convert.py
+++ b/fixit/convert.py
@@ -16,4 +16,4 @@ def km_to_miles(km: float) -> float:
 
 
 def miles_to_km(miles: float) -> float:
-    return miles / KM_PER_MILE
+    return miles * KM_PER_MILE
diff --git a/tests/test_convert.py b/tests/test_convert.py
index 196453e..80c2bf1 100644
--- a/tests/test_convert.py
+++ b/tests/test_convert.py
@@ -15,6 +15,18 @@ def test_km_to_miles():
     assert km_to_miles(10) == pytest.approx(6.21371, rel=1e-4)
 
 
-@pytest.mark.xfail(reason="Known bug: miles_to_km divides instead of multiplies")
 def test_miles_to_km():
     assert miles_to_km(1) == pytest.approx(1.609344)
+
+
+def test_negative_celsius():
+    assert celsius_to_fahrenheit(-20)==-4
+
+def test_zero_celsius():
+    assert celsius_to_fahrenheit(0) == 32
+
+def test_absolute_zero():
+    assert celsius_to_fahrenheit(-273.15) == pytest.approx(-459.67)
+
+def test_float_km_to_miles():
+    assert km_to_miles(1.5) == pytest.approx(0.932056788)
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