diff --git a/plugins/Math/plugin.py b/plugins/Math/plugin.py
index 1285a7581..81c2ff3eb 100644
--- a/plugins/Math/plugin.py
+++ b/plugins/Math/plugin.py
@@ -246,7 +246,7 @@ class Math(callbacks.Plugin):
             newNum = convertcore.convert(number, unit1, unit2)
             if isinstance(newNum, float):
                 zeros = 0
-                for char in str(newNum).split('.')[1]:
+                for char in "{:f}".format(newNum).split('.')[1]:
                     if char != '0':
                         break
                     zeros += 1
diff --git a/plugins/Math/test.py b/plugins/Math/test.py
index dc7b6387d..d33aff396 100644
--- a/plugins/Math/test.py
+++ b/plugins/Math/test.py
@@ -166,6 +166,7 @@ class MathTestCase(PluginTestCase):
         self.assertResponse('convert 1 m to cm', '100')
         self.assertResponse('convert m to cm', '100')
         self.assertResponse('convert 3 metres to km', '0.003')
+        self.assertResponse('convert 1 cm to km', '1e-05')
         self.assertResponse('convert 32 F to C', '0')
         self.assertResponse('convert 32 C to F', '89.6')
         self.assertResponse('convert [calc 2*pi] rad to degree', '360')