diff --git a/a1/divisible9.cases b/a1/divisible9.cases
index cb48143..c7b2955 100644
--- a/a1/divisible9.cases
+++ b/a1/divisible9.cases
@@ -29,4 +29,52 @@ no
 no
 
 -19
+no
+
+10000
+no
+
+9999
+yes
+
+-10000
+no
+
+-9999
+yes
+
+81
+yes
+
+80
+no
+
+-81
+yes
+
+-80
+no
+
+5000
+no
+
+4500
+yes
+
+-5000
+no
+
+-4500
+yes
+
+9996
+yes
+
+9995
+no
+
+-9996
+yes
+
+-9995
 no
\ No newline at end of file