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: 400-190
    Solution:
    400-190 = 210
    Column vertical calculation:

			1
			4	0	0
➖			1	9	0
			2	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-200
    Solution:
    800-200 = 600
    Column vertical calculation:

			8	0	0
➖			2	0	0
			6	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 360-300
    Solution:
    360-300 = 60
    Column vertical calculation:

			3	6	0
➖			3	0	0
			0	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 140+600
    Solution:
    140+600 = 740
    Column vertical calculation:

			1	4	0
➕			6	0	0
			7	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 280+300
    Solution:
    280+300 = 580
    Column vertical calculation:

			2	8	0
➕			3	0	0
			5	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 420+600
    Solution:
    420+600 = 1020
    Column vertical calculation:

			4	2	0
➕		1	6	0	0
		1	0	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 920-700
    Solution:
    920-700 = 220
    Column vertical calculation:

			9	2	0
➖			7	0	0
			2	2	0

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>>注：本次最多计算 7 道题。

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