diff --git a/src/main/java/com/yudong80/reactivejava/chapter03/Gugudan.java b/src/main/java/com/yudong80/reactivejava/chapter03/Gugudan.java
index f02c82d..2d3cf4e 100644
--- a/src/main/java/com/yudong80/reactivejava/chapter03/Gugudan.java
+++ b/src/main/java/com/yudong80/reactivejava/chapter03/Gugudan.java
@@ -32,7 +32,7 @@ public void reactiveV2() {
 		
 		Function<Integer,Observable<String>> gugudan = num -> 
 			Observable.range(1,9)
-			   		  .map(row -> num + " * " + row + " = " + dan*row);			
+			   		  .map(row -> num + " * " + row + " = " + num * row);			
 		Observable<String> source = Observable.just(dan).flatMap(gugudan);
 		source.subscribe(System.out::println);
 		in.close();
@@ -45,7 +45,7 @@ public void reactiveV3() {
 			
 		Observable<String> source = Observable.just(dan)
 				.flatMap(num -> Observable.range(1,9)
-		   		  			  .map(row -> num + " * " + row + " = " + dan*row));
+		   		  			  .map(row -> num + " * " + row + " = " + num * row));
 		source.subscribe(System.out::println);
 		in.close();
 	}