diff --git a/src/mscorlib/src/System/MathF.cs b/src/mscorlib/src/System/MathF.cs
index bca5559b803e..2514eee387ab 100644
--- a/src/mscorlib/src/System/MathF.cs
+++ b/src/mscorlib/src/System/MathF.cs
@@ -33,8 +33,7 @@ public static class MathF
         public const float E = 2.71828183f;
 
         [System.Security.SecuritySafeCritical]  // auto-generated
-        [MethodImplAttribute(MethodImplOptions.InternalCall)]
-        public static extern float Abs(float x);
+        public static float Abs(float x) => Math.Abs(x);
 
         [System.Security.SecuritySafeCritical]  // auto-generated
         [MethodImplAttribute(MethodImplOptions.InternalCall)]
@@ -157,10 +156,10 @@ public static float Log(float x, float y)
         public static extern float Log10(float x);
 
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
-        public static float Max(float x, float y) => ((x > y) || float.IsNaN(x)) ? x : y;
+        public static float Max(float x, float y) => Math.Max(x, y);
 
         [ReliabilityContract(Consistency.WillNotCorruptState, Cer.Success)]
-        public static float Min(float x, float y) => ((x < y) || float.IsNaN(x)) ? x : y;
+        public static float Min(float x, float y) => Math.Min(x, y);
 
         [System.Security.SecuritySafeCritical]  // auto-generated
         [MethodImplAttribute(MethodImplOptions.InternalCall)]
@@ -208,23 +207,7 @@ public static float Round(float x, MidpointRounding mode)
             return InternalRound(x, 0, mode);
         }
 
-        public static int Sign(float x)
-        {
-            if (x < 0)
-            {
-                return -1;
-            }
-            else if (x > 0)
-            {
-                return 1;
-            }
-            else if (x == 0)
-            {
-                return 0;
-            }
-
-            throw new ArithmeticException(Environment.GetResourceString("Arithmetic_NaN"));
-        }
+        public static int Sign(float x) => Math.Sign(x);
 
         [System.Security.SecuritySafeCritical]  // auto-generated
         [MethodImplAttribute(MethodImplOptions.InternalCall)]
diff --git a/src/vm/ecalllist.h b/src/vm/ecalllist.h
index 2277b0347022..ea0cad35df27 100644
--- a/src/vm/ecalllist.h
+++ b/src/vm/ecalllist.h
@@ -1252,7 +1252,6 @@ FCFuncStart(gMathFuncs)
 FCFuncEnd()
 
 FCFuncStart(gMathFFuncs)
-    FCIntrinsic("Abs", COMSingle::Abs, CORINFO_INTRINSIC_Abs)
     FCIntrinsic("Acos", COMSingle::Acos, CORINFO_INTRINSIC_Acos)
     FCIntrinsic("Asin", COMSingle::Asin, CORINFO_INTRINSIC_Asin)
     FCIntrinsic("Atan", COMSingle::Atan, CORINFO_INTRINSIC_Atan)