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: 47-14
    Solution:
    47-14 = 33
    Column vertical calculation:

			4	7
➖			1	4
			3	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 36-21
    Solution:
    36-21 = 15
    Column vertical calculation:

			3	6
➖			2	1
			1	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-17
    Solution:
    68-17 = 51
    Column vertical calculation:

			6	8
➖			1	7
			5	1

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 77-23
    Solution:
    77-23 = 54
    Column vertical calculation:

			7	7
➖			2	3
			5	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 46-13
    Solution:
    46-13 = 33
    Column vertical calculation:

			4	6
➖			1	3
			3	3

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 49-15
    Solution:
    49-15 = 34
    Column vertical calculation:

			4	9
➖			1	5
			3	4

[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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