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: 44-6
    Solution:
    44-6 = 38
    Column vertical calculation:

			1
			4	4
➖				6
			3	8

[2/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 26-20
    Solution:
    26-20 = 6
    Column vertical calculation:

			2	6
➖			2	0
			0	6

[3/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-54
    Solution:
    87-54 = 33
    Column vertical calculation:

			8	7
➖			5	4
			3	3

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