Addition
4+5
9
5-4
1
Value of the number 2 in 12
2
10+11
21
17-0
17
value of the number 1 in 12
10
12+7
19
13-7
6
value of the number 7 in 74
70
22+13
35
21-9
12
what is this number 40+7
47
47+39
86
42-29
13
what is this number 100+60+4
164