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

[1/3 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 44+24
    Solution:
    44+24 = 68
    Column vertical calculation:

			4	4
➕			2	4
			6	8

[2/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 62-21
    Solution:
    62-21 = 41
    Column vertical calculation:

			6	2
➖			2	1
			4	1

[3/3 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-48
    Solution:
    78-48 = 30
    Column vertical calculation:

			7	8
➖			4	8
			3	0

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