2 digit addition
35+27---- use traditional algorithm
62
100+167---use traditional algorithm
267
45-17----use traditional algorithm
28
225-130---use traditional algorithm
95
25.5+12.4
37.9
57+45--- use traditional algorithm
212+259---use traditional algorithm
471
65-29----use traditional algorithm
36
250-187----use traditional algorithm
63
98.6-70.2
28.4
97+43----use traditional algorithm
140
355+766----use traditional algorithm
1121
97-48----use traditional algorithm
49
400-293----use traditional algorithm
107
427.7
50+48---use base ten blocks
98
127+180----use base ten blocks
307
72-46--- use base ten blocks
26
175-138----use base ten blocks
37
837.8+595.5
1443.3
97+85---use base ten blocks
182
123+289---use base ten blocks
412
90-39---use base ten blocks
51
262-171---use base ten blocks
91
726.5-557.3
169.2