Show:
adding 1 digit
adding 2 digits
regrouping
3 digit
more regrouping
100
5+6
What is 11
100
12+15
What is 27
100
46+55
What is 101
100
123+234
What is 357
100
105+217
What is 322
200
4+8
What is 12
200
15+34
What is 49
200
39+66
What is 105
200
622+135
What is 757
200
378+278
What is 656
300
7+6
What is 13
300
22+51
What is 73
300
77+46
What is 123
300
204+356
What is 560
300
835+284
What is 1119
400
8+7
What is 15
400
84+15
What is 99
400
86+76
What is 162
400
379+438
What is 817
400
934+634
What is 1568
500
9+8
What is 17
500
63+35
What is 98
500
97+45
What is 142
500
396+546
What is 942
500
937+968
What is 1905