addition
15+8
23
21-6
15
what number is this?
七
7
45+19
64
72-41
31
what number is this ?
六
72+23+55
150
94-66
28
what number is this?
七十
70
98+43+31
172
298-109
189
what number is this?
五十一
51
569+201+142
912
509-327
182
what number is this?
一百十二
112