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: 18-19
    Solution:
    18-19 = - (19 - 18) = - 1
    Column vertical calculation:

			1	9
➖			1	8
			0	1

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-64
    Solution:
    99-64 = 35
    Column vertical calculation:

			9	9
➖			6	4
			3	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 23-10
    Solution:
    23-10 = 13
    Column vertical calculation:

			2	3
➖			1	0
			1	3

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-85
    Solution:
    96-85 = 11
    Column vertical calculation:

			9	6
➖			8	5
			1	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 48-15
    Solution:
    48-15 = 33
    Column vertical calculation:

			4	8
➖			1	5
			3	3

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 62-31
    Solution:
    62-31 = 31
    Column vertical calculation:

			6	2
➖			3	1
			3	1

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-67
    Solution:
    82-67 = 15
    Column vertical calculation:

			1
			8	2
➖			6	7
			1	5

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>>注：本次最多计算 7 道题。

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