diff --git a/lib/matrix.rb b/lib/matrix.rb
index 30f9f81..66107ff 100644
--- a/lib/matrix.rb
+++ b/lib/matrix.rb
@@ -1457,25 +1457,16 @@ class Matrix
     end
 
     # ARITHMETIC
-    def +(other)
-      case other
-      when Numeric
-        Scalar.new(@value + other)
-      when Vector, Matrix
-        Scalar.Raise ErrOperationNotDefined, "+", @value.class, other.class
-      else
-        apply_through_coercion(other, __method__)
-      end
-    end
-
-    def -(other)
-      case other
-      when Numeric
-        Scalar.new(@value - other)
-      when Vector, Matrix
-        Scalar.Raise ErrOperationNotDefined, "-", @value.class, other.class
-      else
-        apply_through_coercion(other, __method__)
+    %i(+ -).each do |op|
+      define_method(op) do |other|
+        case other
+        when Numeric
+          Scalar.new(@value.send(op, other))
+        when Vector, Matrix
+          Scalar.Raise ErrOperationNotDefined, op, @value.class, other.class
+        else
+          apply_through_coercion(other, op)
+        end
       end
     end