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: 230-400
    Solution:
    230-400 = - (400 - 230) = - 170
    Column vertical calculation:

			1
			4	0	0
➖			2	3	0
			1	7	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 840-200
    Solution:
    840-200 = 640
    Column vertical calculation:

			8	4	0
➖			2	0	0
			6	4	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 400-300
    Solution:
    400-300 = 100
    Column vertical calculation:

			4	0	0
➖			3	0	0
			1	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 180+600
    Solution:
    180+600 = 780
    Column vertical calculation:

			1	8	0
➕			6	0	0
			7	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 320+300
    Solution:
    320+300 = 620
    Column vertical calculation:

			3	2	0
➕			3	0	0
			6	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 460+600
    Solution:
    460+600 = 1060
    Column vertical calculation:

			4	6	0
➕		1	6	0	0
		1	0	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 960-700
    Solution:
    960-700 = 260
    Column vertical calculation:

			9	6	0
➖			7	0	0
			2	6	0

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>>注：本次最多计算 7 道题。

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