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: 18-14
    Solution:
    18-14 = 4
    Column vertical calculation:

			1	8
➖			1	4
			0	4

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-69
    Solution:
    99-69 = 30
    Column vertical calculation:

			9	9
➖			6	9
			3	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 23-15
    Solution:
    23-15 = 8
    Column vertical calculation:

			1
			2	3
➖			1	5
			0	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-90
    Solution:
    96-90 = 6
    Column vertical calculation:

			9	6
➖			9	0
			0	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 48-20
    Solution:
    48-20 = 28
    Column vertical calculation:

			4	8
➖			2	0
			2	8

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 62-36
    Solution:
    62-36 = 26
    Column vertical calculation:

			1
			6	2
➖			3	6
			2	6

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 82-72
    Solution:
    82-72 = 10
    Column vertical calculation:

			8	2
➖			7	2
			1	0

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>>注：本次最多计算 7 道题。

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