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: 250+390
    Solution:
    250+390 = 640
    Column vertical calculation:

			2	5	0
➕			31	9	0
			6	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-200
    Solution:
    520-200 = 320
    Column vertical calculation:

			5	2	0
➖			2	0	0
			3	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-130
    Solution:
    880-130 = 750
    Column vertical calculation:

			8	8	0
➖			1	3	0
			7	5	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 620+100
    Solution:
    620+100 = 720
    Column vertical calculation:

			6	2	0
➕			1	0	0
			7	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 360+230
    Solution:
    360+230 = 590
    Column vertical calculation:

			3	6	0
➕			2	3	0
			5	9	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 440+460
    Solution:
    440+460 = 900
    Column vertical calculation:

			4	4	0
➕			41	6	0
			9	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-670
    Solution:
    880-670 = 210
    Column vertical calculation:

			8	8	0
➖			6	7	0
			2	1	0

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>>注：本次最多计算 7 道题。

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