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: 520+500
    Solution:
    520+500 = 1020
    Column vertical calculation:

			5	2	0
➕		1	5	0	0
		1	0	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 540-200
    Solution:
    540-200 = 340
    Column vertical calculation:

			5	4	0
➖			2	0	0
			3	4	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 600-400
    Solution:
    600-400 = 200
    Column vertical calculation:

			6	0	0
➖			4	0	0
			2	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 200+500
    Solution:
    200+500 = 700
    Column vertical calculation:

			2	0	0
➕			5	0	0
			7	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 580+300
    Solution:
    580+300 = 880
    Column vertical calculation:

			5	8	0
➕			3	0	0
			8	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 320+600
    Solution:
    320+600 = 920
    Column vertical calculation:

			3	2	0
➕			6	0	0
			9	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 820-400
    Solution:
    820-400 = 420
    Column vertical calculation:

			8	2	0
➖			4	0	0
			4	2	0

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>>注：本次最多计算 7 道题。

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