Overview: 1 questions will be solved this time.Among them
           ☆1 integer calculations
[1/1 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31*3584229390681    Solution:
    31*3584229390681 = 
111111111111111    Column vertical calculation:
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 3 | 1 | 
| ✖ |   |   |   |   |   |   | 3 | 5 | 8 | 4 | 2 | 2 | 9 | 3 | 9 | 0 | 6 | 8 | 1 | 
  | 
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 3 | 1 | 
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 2 | 4 | 8 |   | 
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 1 | 8 | 6 |   |   | 
|   |   |   |   |   |   |   |   |   |   |   |   |   |   |   | 0 | 0 |   |   |   | 
|   |   |   |   |   |   |   |   |   |   |   |   |   | 2 | 7 | 9 |   |   |   |   | 
|   |   |   |   |   |   |   |   |   |   |   |   |   | 9 | 3 |   |   |   |   |   | 
|   |   |   |   |   |   |   |   |   |   |   | 2 | 7 | 9 |   |   |   |   |   |   | 
|   |   |   |   |   |   |   |   |   |   |   | 6 | 2 |   |   |   |   |   |   |   | 
|   |   |   |   |   |   |   |   |   |   | 6 | 2 |   |   |   |   |   |   |   |   | 
|   |   |   |   |   |   |   |   | 1 | 2 | 4 |   |   |   |   |   |   |   |   |   | 
|   |   |   |   |   |   |   | 2 | 4 | 8 |   |   |   |   |   |   |   |   |   |   | 
|   |   |   |   |   |   | 1 | 5 | 5 |   |   |   |   |   |   |   |   |   |   |   | 
|   |   |   |   |   |   | 9 | 3 |   |   |   |   |   |   |   |   |   |   |   |   | 
  | 
|   |   |   |   |   | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 
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