Overview: 6 questions will be solved this time.Among them
           ☆6 integer calculations

[1/6 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-28
    Solution:
    87-28 = 59
    Column vertical calculation:

			1
			8	7
➖			2	8
			5	9

[2/6 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-12
    Solution:
    81-12 = 69
    Column vertical calculation:

			1
			8	1
➖			1	2
			6	9

[3/6 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 67+33
    Solution:
    67+33 = 100
    Column vertical calculation:

			6	7
➕		1	31	3
		1	0	0

[4/6 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 67-48
    Solution:
    67-48 = 19
    Column vertical calculation:

			1
			6	7
➖			4	8
			1	9

[5/6 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-33
    Solution:
    92-33 = 59
    Column vertical calculation:

			1
			9	2
➖			3	3
			5	9

[6/6 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 93-45
    Solution:
    93-45 = 48
    Column vertical calculation:

			1
			9	3
➖			4	5
			4	8

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