diff --git a/modern/src/maki-interpreter/objects.test.js b/modern/src/maki-interpreter/objects.test.js
index ad004780..3f534be8 100644
--- a/modern/src/maki-interpreter/objects.test.js
+++ b/modern/src/maki-interpreter/objects.test.js
@@ -148,8 +148,6 @@ Set {
   "System.seteq",
   "System.getmouseposx",
   "System.getmouseposy",
-  "System.floattostring",
-  "System.stringtofloat",
   "System.integertolongtime",
   "System.integertotime",
   "System.datetotime",
diff --git a/modern/src/runtime/System.ts b/modern/src/runtime/System.ts
index c856f278..14cf055c 100644
--- a/modern/src/runtime/System.ts
+++ b/modern/src/runtime/System.ts
@@ -382,14 +382,12 @@ class System extends MakiObject {
     return;
   }
 
-  floattostring(value: number, ndigits: number) {
-    unimplementedWarning("floattostring");
-    return;
+  floattostring(value: number, ndigits: number): string {
+    return value.toFixed(ndigits).toString();
   }
 
-  stringtofloat(str: string) {
-    unimplementedWarning("stringtofloat");
-    return;
+  stringtofloat(str: string): number {
+    return parseFloat(str);
   }
 
   integertolongtime(value: number) {