diff --git a/itn/chinese/rules/cardinal.py b/itn/chinese/rules/cardinal.py
index f98a2f3..eee1f97 100644
--- a/itn/chinese/rules/cardinal.py
+++ b/itn/chinese/rules/cardinal.py
@@ -134,6 +134,8 @@ def build_tagger(self):
         # requires at least one normal digit before repeat_digit
         cardinal |= digits.plus + repeat_digit + digits.star
 
+        cardinal |= add_weight(number + dot + digits.plus + accep("亿")|accep("万"), -0.5)
+
         # 4. 特殊格式的数字 + 标准数字
         # cardinal string like 23
         if self.enable_standalone_number:
diff --git a/itn/chinese/test/data/cardinal.txt b/itn/chinese/test/data/cardinal.txt
index 5ed4676..ad6c708 100644
--- a/itn/chinese/test/data/cardinal.txt
+++ b/itn/chinese/test/data/cardinal.txt
@@ -27,3 +27,5 @@
 尾号幺七零二 => 尾号1702
 尾号一二三四 => 尾号1234
 幺八五洞幺拐两零柒幺玖 => 18501720719
+十二点四三万 => 12.43万
+五百零六点五三六亿 => 506.536亿