Overview: 5 questions will be solved this time.Among them
           ☆5 integer calculations

[1/5 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 9831-1389
    Solution:
    9831-1389 = 8442
    Column vertical calculation:

				1	1
			9	8	3	1
➖			1	3	8	9
			8	4	4	2

[2/5 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 8442-2448
    Solution:
    8442-2448 = 5994
    Column vertical calculation:

			1	1	1
			8	4	4	2
➖			2	4	4	8
			5	9	9	4

[3/5 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 9965-5699
    Solution:
    9965-5699 = 4266
    Column vertical calculation:

				1	1
			9	9	6	5
➖			5	6	9	9
			4	2	6	6

[4/5 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 6642-2466
    Solution:
    6642-2466 = 4176
    Column vertical calculation:

				1	1
			6	6	4	2
➖			2	4	6	6
			4	1	7	6

[5/5 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 7641-1467
    Solution:
    7641-1467 = 6174
    Column vertical calculation:

				1	1
			7	6	4	1
➖			1	4	6	7
			6	1	7	4

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