Overview: 3 questions will be solved this time.Among them
           ☆3 integer calculations

[1/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 69-23
    Solution:
    69-23 = 46
    Column vertical calculation:

			6	9
➖			2	3
			4	6

[2/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 77-35
    Solution:
    77-35 = 42
    Column vertical calculation:

			7	7
➖			3	5
			4	2

[3/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 84-20
    Solution:
    84-20 = 64
    Column vertical calculation:

			8	4
➖			2	0
			6	4

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