diff --git a/lib/matrix.rb b/lib/matrix.rb
index 026492b..30f9f81 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -878,57 +878,36 @@ class Matrix
   end
 
   #
-  # Matrix addition.
+  # Matrix addition and subtraction.
   #   Matrix.scalar(2,5) + Matrix[[1,0], [-4,7]]
   #     =>  6  0
   #        -4 12
   #
-  def +(m)
-    case m
-    when Numeric
-      Matrix.Raise ErrOperationNotDefined, "+", self.class, m.class
-    when Vector
-      m = self.class.column_vector(m)
-    when Matrix
-    else
-      return apply_through_coercion(m, __method__)
-    end
-
-    Matrix.Raise ErrDimensionMismatch unless row_count == m.row_count and column_count == m.column_count
-
-    rows = Array.new(row_count) {|i|
-      Array.new(column_count) {|j|
-        self[i, j] + m[i, j]
-      }
-    }
-    new_matrix rows, column_count
-  end
-
-  #
-  # Matrix subtraction.
   #   Matrix[[1,5], [4,2]] - Matrix[[9,3], [-4,1]]
   #     => -8  2
   #         8  1
   #
-  def -(m)
-    case m
-    when Numeric
-      Matrix.Raise ErrOperationNotDefined, "-", self.class, m.class
-    when Vector
-      m = self.class.column_vector(m)
-    when Matrix
-    else
-      return apply_through_coercion(m, __method__)
-    end
+  %i(+ -).each do |op|
+    define_method(op) do |m|
+      case m
+      when Numeric
+        Matrix.Raise ErrOperationNotDefined, op, self.class, m.class
+      when Vector
+        m = self.class.column_vector(m)
+      when Matrix
+      else
+        return apply_through_coercion(m, op)
+      end
 
-    Matrix.Raise ErrDimensionMismatch unless row_count == m.row_count and column_count == m.column_count
+      Matrix.Raise ErrDimensionMismatch unless row_count == m.row_count && column_count == m.column_count
 
-    rows = Array.new(row_count) {|i|
-      Array.new(column_count) {|j|
-        self[i, j] - m[i, j]
+      rows = Array.new(row_count) {|i|
+        Array.new(column_count) {|j|
+          self[i, j].send(op, m[i, j])
+        }
       }
-    }
-    new_matrix rows, column_count
+      new_matrix rows, column_count
+    end
   end
 
   #