math 1
199 + 1 =
200
9000 + 12
9012
2011 + 1
2012
10 + 10
20
1000 + 1000
2000
6+0 =
6
1000 + 1 =
1000
4=
4
33+33=
66
55+55
110
20 + 20 =
40
199 + 199 =
398
999 + 2 =
1002
2000+2000 =
4000
445 - 3
442
80+1 =
81
56 + 4 =
60
77+0=
77
8 =
8
300
999 + 1 =
1000
1111+1111 =
2222
1-501 =
500
85+85 =
255
305 - 3 =
303