Answers

2016-04-29T18:11:01+08:00
   12, 346, 397
+   1, 643, 267
____________
     13, 989, 664
0
2016-04-30T16:28:55+08:00
 The answer will be 

   12 346 397
+   1 643 267
= 13 989 664
0