Addition using base 10 blocks
100 + 300 =
400
123 + 321
444
905 + 428
1,333
532 + 325 =
857
154 + 623 =
777
342 + 73 =
415
926 + 35 =
961
622 + 88 =
710
105 + 97 =
202
640 + 25 =
665
665 + 392 =
1,057
157 + 448 =
605
586 + 107 =
693
788 + 365 =
1,153
567 + 830 =
1,397
650 + 630 =
1,280
438 + 557 =
995
631 + 365 =
996
233 + 345 =
578
442 + 318 =
1,192