πMental Math
72+10
82
87+56
143
127+18
145
5 - 3 =
2
83+100
183
35+25
60
136+16
152
10 - 5 =
5
65+40
105
27+46
73
109+41
150
27 - 12 =
15
85+42
127
53+19
72
29+148
177
40 + ___ = 97
57
127+___=167
40
44+27
71
158+67
225
323 - 202 =
121