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: 98-75
    Solution:
    98-75 = 23
    Column vertical calculation:

			9	8
➖			7	5
			2	3

[2/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 59-36
    Solution:
    59-36 = 23
    Column vertical calculation:

			5	9
➖			3	6
			2	3

[3/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 53-28
    Solution:
    53-28 = 25
    Column vertical calculation:

			1
			5	3
➖			2	8
			2	5

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