diff --git a/src/libcore/num/f32.rs b/src/libcore/num/f32.rs
index 8092aa67b8fa..add42a2ddce8 100644
--- a/src/libcore/num/f32.rs
+++ b/src/libcore/num/f32.rs
@@ -429,12 +429,12 @@ fn log10(self) -> f32 {
 
     /// Converts to degrees, assuming the number is in radians.
     #[inline]
-    fn to_degrees(self) -> f32 { self * (180.0f32 / Float::pi()) }
+    fn to_degrees(self) -> f32 { self * (180.0f32 / consts::PI) }
 
     /// Converts to radians, assuming the number is in degrees.
     #[inline]
     fn to_radians(self) -> f32 {
-        let value: f32 = Float::pi();
+        let value: f32 = consts::PI;
         self * (value / 180.0f32)
     }
 }
diff --git a/src/libcore/num/f64.rs b/src/libcore/num/f64.rs
index 3ecedac732d8..12c0771d0b93 100644
--- a/src/libcore/num/f64.rs
+++ b/src/libcore/num/f64.rs
@@ -437,12 +437,12 @@ fn log10(self) -> f64 {
 
     /// Converts to degrees, assuming the number is in radians.
     #[inline]
-    fn to_degrees(self) -> f64 { self * (180.0f64 / Float::pi()) }
+    fn to_degrees(self) -> f64 { self * (180.0f64 / consts::PI) }
 
     /// Converts to radians, assuming the number is in degrees.
     #[inline]
     fn to_radians(self) -> f64 {
-        let value: f64 = Float::pi();
+        let value: f64 = consts::PI;
         self * (value / 180.0)
     }
 }
diff --git a/src/libcore/slice.rs b/src/libcore/slice.rs
index 7923c46717e6..48e52fab51c5 100644
--- a/src/libcore/slice.rs
+++ b/src/libcore/slice.rs
@@ -42,7 +42,7 @@
 use cmp;
 use default::Default;
 use iter::*;
-use num::{Int, div_rem};
+use num::Int;
 use ops;
 use option::{None, Option, Some};
 use ptr;
@@ -1384,7 +1384,8 @@ fn size_hint(&self) -> (uint, Option<uint>) {
         if self.v.len() == 0 {
             (0, Some(0))
         } else {
-            let (n, rem) = div_rem(self.v.len(), self.size);
+            let n = self.v.len() / self.size;
+            let rem = self.v.len() % self.size;
             let n = if rem > 0 { n+1 } else { n };
             (n, Some(n))
         }
@@ -1457,7 +1458,8 @@ fn size_hint(&self) -> (uint, Option<uint>) {
         if self.v.len() == 0 {
             (0, Some(0))
         } else {
-            let (n, rem) = div_rem(self.v.len(), self.chunk_size);
+            let n = self.v.len() / self.chunk_size;
+            let rem = self.v.len() % self.chunk_size;
             let n = if rem > 0 { n + 1 } else { n };
             (n, Some(n))
         }