diff --git a/1-js/04-object-basics/01-object/article.md b/1-js/04-object-basics/01-object/article.md
index ed8a3f4d7b..c3dee77018 100644
--- a/1-js/04-object-basics/01-object/article.md
+++ b/1-js/04-object-basics/01-object/article.md
@@ -428,9 +428,9 @@ So, "49" is an integer property name, because when it's transformed to an intege
 
 ```js run
 // Math.trunc is a built-in function that removes the decimal part
-alert( String(Math.trunc(Number("49"))) ); // "49", same, integer property
-alert( String(Math.trunc(Number("+49"))) ); // "49", not same "+49" ⇒ not integer property
-alert( String(Math.trunc(Number("1.2"))) ); // "1", not same "1.2" ⇒ not integer property
+alert( String(Math.trunc("49")) ); // "49", same, integer property
+alert( String(Math.trunc("+49")) ); // "49", not same "+49" ⇒ not integer property
+alert( String(Math.trunc("1.2")) ); // "1", not same "1.2" ⇒ not integer property
 ```
 ````