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: 1+1
    Solution:
    1+1 = 2
    Column vertical calculation:

			1
➕			1
			2

[2/4 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 3-4
    Solution:
    3-4 = - (4 - 3) = - 1
    Column vertical calculation:

			4
➖			3
			1

[3/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 6*9
    Solution:
    6*9 = 54
    Column vertical calculation:

						6
✖						9
					5	4
					5	4

[4/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 3245*5886
    Solution:
    3245*5886 = 19100070
    Column vertical calculation:

									3	2	4	5
✖									5	8	8	6
								1	9	4	7	0
							2	5	9	6	0
						2	5	9	6	0
					1	6	2	2	5
					1	9	1	0	0	0	7	0

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