Chicago in the 60s
The summation of 2 and 2
What is 4?
2+2
4
10+10
20
15+15
30
10-5
5
The summation of 4 and 4
What is 8?
3+3
6
11+11
22
16+16
32
10-4
6
The summation of 5 and 5
What is 10?
4+4
8
12+12
24
17+17
34
10-3
7
6 + 6
12
5+5
10
13+13
26
18+18
36
10-2
8
7 +7
14
6+6
12
14+14
28
19+19
38
10-1
9