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: 400+580
    Solution:
    400+580 = 980
    Column vertical calculation:

			4	0	0
➕			5	8	0
			9	8	0

[2/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 200+480
    Solution:
    200+480 = 680
    Column vertical calculation:

			2	0	0
➕			4	8	0
			6	8	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+480
    Solution:
    300+480 = 780
    Column vertical calculation:

			3	0	0
➕			4	8	0
			7	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-580
    Solution:
    800-580 = 220
    Column vertical calculation:

			1
			8	0	0
➖			5	8	0
			2	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 700-480
    Solution:
    700-480 = 220
    Column vertical calculation:

			1
			7	0	0
➖			4	8	0
			2	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 700-380
    Solution:
    700-380 = 320
    Column vertical calculation:

			1
			7	0	0
➖			3	8	0
			3	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 120+380
    Solution:
    120+380 = 500
    Column vertical calculation:

			1	2	0
➕			31	8	0
			5	0	0

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>>注：本次最多计算 7 道题。

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