Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 630+90
    Solution:
    630+90 = 720
    Column vertical calculation:

			6	3	0
➕			1	9	0
			7	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 210-80
    Solution:
    210-80 = 130
    Column vertical calculation:

			1
			2	1	0
➖				8	0
			1	3	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 290+400
    Solution:
    290+400 = 690
    Column vertical calculation:

			2	9	0
➕			4	0	0
			6	9	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 730+800
    Solution:
    730+800 = 1530
    Column vertical calculation:

			7	3	0
➕		1	8	0	0
		1	5	3	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 270-60
    Solution:
    270-60 = 210
    Column vertical calculation:

			2	7	0
➖				6	0
			2	1	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 500-300
    Solution:
    500-300 = 200
    Column vertical calculation:

			5	0	0
➖			3	0	0
			2	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 530+900
    Solution:
    530+900 = 1430
    Column vertical calculation:

			5	3	0
➕		1	9	0	0
		1	4	3	0

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>>注：本次最多计算 7 道题。

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