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+300
    Solution:
    500+300 = 800
    Column vertical calculation:

			5	0	0
➕			3	0	0
			8	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-400
    Solution:
    520-400 = 120
    Column vertical calculation:

			5	2	0
➖			4	0	0
			1	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 580-200
    Solution:
    580-200 = 380
    Column vertical calculation:

			5	8	0
➖			2	0	0
			3	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 1280+300
    Solution:
    1280+300 = 1580
    Column vertical calculation:

			1	2	8	0
➕				3	0	0
			1	5	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 560+100
    Solution:
    560+100 = 660
    Column vertical calculation:

			5	6	0
➕			1	0	0
			6	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+400
    Solution:
    300+400 = 700
    Column vertical calculation:

			3	0	0
➕			4	0	0
			7	0	0

[7/7 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

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>>注：本次最多计算 7 道题。

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