diff --git a/schema.go b/schema.go
index e2773c8..323fe85 100644
--- a/schema.go
+++ b/schema.go
@@ -453,7 +453,7 @@
 				},
 			))
 		}
-		if multipleOfValue.Cmp(big.NewFloat(0)) <= 0 {
+		if multipleOfValue.Cmp(big.NewRat(0, 1)) <= 0 {
 			return errors.New(formatErrorDescription(
 				Locale.GreaterThanZero(),
 				ErrorDetails{"number": KEY_MULTIPLE_OF},
diff --git a/subSchema.go b/subSchema.go
index f412f17..362d86c 100644
--- a/subSchema.go
+++ b/subSchema.go
@@ -103,11 +103,11 @@
 	propertiesChildren          []*subSchema
 
 	// validation : number / integer
-	multipleOf       *big.Float
-	maximum          *big.Float
-	exclusiveMaximum *big.Float
-	minimum          *big.Float
-	exclusiveMinimum *big.Float
+	multipleOf       *big.Rat
+	maximum          *big.Rat
+	exclusiveMaximum *big.Rat
+	minimum          *big.Rat
+	exclusiveMinimum *big.Rat
 
 	// validation : string
 	minLength *int
diff --git a/utils.go b/utils.go
index cfd8948..88d223f 100644
--- a/utils.go
+++ b/utils.go
@@ -120,7 +120,7 @@
 
 	jsonNumber := what.(json.Number)
 
-	bigFloat, isValidNumber := new(big.Float).SetString(string(jsonNumber))
+	bigFloat, isValidNumber := new(big.Rat).SetString(string(jsonNumber))
 
 	return isValidNumber && bigFloat.IsInt()
 
@@ -168,11 +168,11 @@
 	return nil
 }
 
-func mustBeNumber(what interface{}) *big.Float {
+func mustBeNumber(what interface{}) *big.Rat {
 
 	if isJsonNumber(what) {
 		number := what.(json.Number)
-		float64Value, success := new(big.Float).SetString(string(number))
+		float64Value, success := new(big.Rat).SetString(string(number))
 		if success {
 			return float64Value
 		} else {
diff --git a/validation.go b/validation.go
index 9169667..090c11e 100644
--- a/validation.go
+++ b/validation.go
@@ -842,17 +842,16 @@
 	}
 
 	number := value.(json.Number)
-	float64Value, _ := new(big.Float).SetString(string(number))
+	float64Value, _ := new(big.Rat).SetString(string(number))
 
 	// multipleOf:
 	if currentSubSchema.multipleOf != nil {
-
-		if q := new(big.Float).Quo(float64Value, currentSubSchema.multipleOf); !q.IsInt() {
+		if q := new(big.Rat).Quo(float64Value, currentSubSchema.multipleOf); !q.IsInt() {
 			result.addInternalError(
 				new(MultipleOfError),
 				context,
 				resultErrorFormatJsonNumber(number),
-				ErrorDetails{"multiple": currentSubSchema.multipleOf},
+				ErrorDetails{"multiple": new(big.Float).SetRat(currentSubSchema.multipleOf)},
 			)
 		}
 	}