Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 69-57
    Solution:
    69-57 = 12
    Column vertical calculation:

			6	9
➖			5	7
			1	2

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 36-23
    Solution:
    36-23 = 13
    Column vertical calculation:

			3	6
➖			2	3
			1	3

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-98
    Solution:
    99-98 = 1
    Column vertical calculation:

			9	9
➖			9	8
			0	1

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 58-37
    Solution:
    58-37 = 21
    Column vertical calculation:

			5	8
➖			3	7
			2	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-23
    Solution:
    96-23 = 73
    Column vertical calculation:

			9	6
➖			2	3
			7	3

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-11
    Solution:
    88-11 = 77
    Column vertical calculation:

			8	8
➖			1	1
			7	7

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 39-24
    Solution:
    39-24 = 15
    Column vertical calculation:

			3	9
➖			2	4
			1	5

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>>注：本次最多计算 7 道题。

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