diff --git a/2024/ruby/day_07.rb b/2024/ruby/day_07.rb
index c92f2a3..6a2d723 100644
--- a/2024/ruby/day_07.rb
+++ b/2024/ruby/day_07.rb
@@ -6,9 +6,11 @@ input = DATA.readlines
 
 pp input.filter_map {|val, vars|
   vals = vars.inject {|n,x|
-    %i[ + * ].flat_map {|op|
-      Array(n).map { _1.send(op, x) }
-    }
+    Array(n).flat_map {[
+      _1 + x,
+      _1 * x,
+      "#{_1}#{x}".to_i,
+    ]}
   }
   vals.include?(val) && val
 }.sum