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: 500+580
    Solution:
    500+580 = 1080
    Column vertical calculation:

			5	0	0
➕		1	5	8	0
		1	0	8	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-280
    Solution:
    520-280 = 240
    Column vertical calculation:

			1
			5	2	0
➖			2	8	0
			2	4	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 580-480
    Solution:
    580-480 = 100
    Column vertical calculation:

			5	8	0
➖			4	8	0
			1	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 1280+580
    Solution:
    1280+580 = 1860
    Column vertical calculation:

			1	2	8	0
➕				51	8	0
			1	8	6	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 560+380
    Solution:
    560+380 = 940
    Column vertical calculation:

			5	6	0
➕			31	8	0
			9	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+680
    Solution:
    300+680 = 980
    Column vertical calculation:

			3	0	0
➕			6	8	0
			9	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-480
    Solution:
    800-480 = 320
    Column vertical calculation:

			1
			8	0	0
➖			4	8	0
			3	2	0

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>>注：本次最多计算 7 道题。

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