Overview: 4 questions will be solved this time.Among them
           ☆4 integer calculations

[1/4 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 56+38
    Solution:
    56+38 = 94
    Column vertical calculation:

			5	6
➕			31	8
			9	4

[2/4 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 27+45
    Solution:
    27+45 = 72
    Column vertical calculation:

			2	7
➕			41	5
			7	2

[3/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 7*5
    Solution:
    7*5 = 35
    Column vertical calculation:

						7
✖						5
					3	5
					3	5

[4/4 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 48-12
    Solution:
    48-12 = 36
    Column vertical calculation:

			4	8
➖			1	2
			3	6

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