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: 98-70
    Solution:
    98-70 = 28
    Column vertical calculation:

			9	8
➖			7	0
			2	8

[2/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 59-31
    Solution:
    59-31 = 28
    Column vertical calculation:

			5	9
➖			3	1
			2	8

[3/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 53-23
    Solution:
    53-23 = 30
    Column vertical calculation:

			5	3
➖			2	3
			3	0

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