Vertical method
32
+
24
56
12 + 25
37
14 + 31
45
54 - 12
42
19
+
41
60
44 + 38
82
43 + 22
65
64 - 50
14
57
+
28
85
34 + 43
77
43 + 37
80
34 - 27
7
15
+
68
83
49 + 43
92
55 + 55
81 - 56
25
What's wrong with my problem?
Show slide 1.
What's wrong with my problem?
Slide 2
What's wrong?
Slide 3
What's wrong?
Slide 4