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+400
    Solution:
    500+400 = 900
    Column vertical calculation:

			5	0	0
➕			4	0	0
			9	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-100
    Solution:
    520-100 = 420
    Column vertical calculation:

			5	2	0
➖			1	0	0
			4	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 580-300
    Solution:
    580-300 = 280
    Column vertical calculation:

			5	8	0
➖			3	0	0
			2	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 1280+400
    Solution:
    1280+400 = 1680
    Column vertical calculation:

			1	2	8	0
➕				4	0	0
			1	6	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 560+200
    Solution:
    560+200 = 760
    Column vertical calculation:

			5	6	0
➕			2	0	0
			7	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+500
    Solution:
    300+500 = 800
    Column vertical calculation:

			3	0	0
➕			5	0	0
			8	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-300
    Solution:
    800-300 = 500
    Column vertical calculation:

			8	0	0
➖			3	0	0
			5	0	0

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>>注：本次最多计算 7 道题。

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