diff --git a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/numeral/fraction/Rules.scala b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/numeral/fraction/Rules.scala
index fbee2414..e17493ca 100644
--- a/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/numeral/fraction/Rules.scala
+++ b/duckling-fork-chinese/core/src/main/scala/com/xiaomi/duckling/dimension/numeral/fraction/Rules.scala
@@ -29,7 +29,7 @@ trait Rules extends DimRules {
     pattern = List(isDimension(Numeral).predicate, "分之".regex, isPositive.predicate),
     prod = tokens {
       case Token(_, n1: NumeralData) :: _ :: Token(_, n2: NumeralData) :: _ =>
-        val v = if (n1.value == 0) 0 else n2.value / n1.value
+        val v = if (n1.value == 0) 0 else (BigDecimal.apply(n2.value)./(BigDecimal.apply(n1.value))).toDouble
         fraction(v, n2.value, n1.value)
     }
   )
@@ -39,7 +39,7 @@ trait Rules extends DimRules {
     pattern = List(isDimension(Numeral).predicate, "/".regex, isDimension(Numeral).predicate),
     prod = tokens {
       case Token(_, n1: NumeralData) :: _ :: Token(_, n2: NumeralData) :: _ =>
-        val v = if (n2.value == 0) 0 else n1.value / n2.value
+        val v = if (n2.value == 0) 0 else (BigDecimal.apply(n1.value)./(BigDecimal.apply(n2.value))).toDouble
         fraction(v, n1.value, n2.value)
     }
   )
@@ -55,7 +55,7 @@ trait Rules extends DimRules {
           case "千" => if (neg) -1000.0 else 1000.0
           case "万" => if (neg) -10000.0 else 10000.0
         }
-        fraction(n.value / scalar, n.value, scalar)
+        fraction((BigDecimal.apply(n.value)./(BigDecimal.apply(scalar))).toDouble, n.value, scalar)
     }
   )
 
@@ -68,7 +68,7 @@ trait Rules extends DimRules {
           case "%" => 0.01
           case "‰" => 0.001
         }
-        fraction(n.value * scalar, n.value, 1/scalar)
+        fraction((BigDecimal.apply(n.value).*(BigDecimal.apply(scalar))).toDouble, n.value, 1/scalar)
     }
   )
 
diff --git a/duckling-fork-chinese/learning/src/main/scala/com/xiaomi/duckling/dimension/numeral/fraction/Examples.scala b/duckling-fork-chinese/learning/src/main/scala/com/xiaomi/duckling/dimension/numeral/fraction/Examples.scala
index ee27616a..e71fce6e 100644
--- a/duckling-fork-chinese/learning/src/main/scala/com/xiaomi/duckling/dimension/numeral/fraction/Examples.scala
+++ b/duckling-fork-chinese/learning/src/main/scala/com/xiaomi/duckling/dimension/numeral/fraction/Examples.scala
@@ -24,6 +24,7 @@ object Examples extends DimExamples {
   override def pairs: List[(Types.ResolvedValue, List[String])] =
     List(
       (0.6, 60.0, 100.0, List("百分之六十")),
+      (0.7, 70.0, 100.0, List("70%")),
       (0.6, 600.0, 1000.0, List("千分之六百")),
       (0.75, 3.0, 4.0, List("4分之3", "四分之3", "3/4")),
       (0.5, 64.0, 128.0, List("一百二十八分之64")),