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: 210-200
    Solution:
    210-200 = 10
    Column vertical calculation:

			2	1	0
➖			2	0	0
			0	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 820-200
    Solution:
    820-200 = 620
    Column vertical calculation:

			8	2	0
➖			2	0	0
			6	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 380-300
    Solution:
    380-300 = 80
    Column vertical calculation:

			3	8	0
➖			3	0	0
			0	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 160+600
    Solution:
    160+600 = 760
    Column vertical calculation:

			1	6	0
➕			6	0	0
			7	6	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+300
    Solution:
    300+300 = 600
    Column vertical calculation:

			3	0	0
➕			3	0	0
			6	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 440+600
    Solution:
    440+600 = 1040
    Column vertical calculation:

			4	4	0
➕		1	6	0	0
		1	0	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 940-700
    Solution:
    940-700 = 240
    Column vertical calculation:

			9	4	0
➖			7	0	0
			2	4	0

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>>注：本次最多计算 7 道题。

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