pre-k-k
1+1
2
6+8
14
54+87
121
673+31
704
64523+54367
118,890
1+2
3
7+7
14
7X_=63
9
958+42
1,000
47865+37325
85,190
2+3
5
3X5
15
321-123
222
645+872
1,510
74135+53686
127,821
4+2
6
46-34
`12
2468-1357
1,111
345+868
1,213
567843+41764
609,607
5+5
10
23+77
100
647-236
411
3860+286
5,146
755332435313+744253525426
1,499,585,960,739