Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 900-200
    Solution:
    900-200 = 700
    Column vertical calculation:

			9	0	0
➖			2	0	0
			7	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-80
    Solution:
    880-80 = 800
    Column vertical calculation:

			8	8	0
➖				8	0
			8	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 640-200
    Solution:
    640-200 = 440
    Column vertical calculation:

			6	4	0
➖			2	0	0
			4	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+50
    Solution:
    700+50 = 750
    Column vertical calculation:

			7	0	0
➕				5	0
			7	5	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 580-180
    Solution:
    580-180 = 400
    Column vertical calculation:

			5	8	0
➖			1	8	0
			4	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 860+300
    Solution:
    860+300 = 1160
    Column vertical calculation:

			8	6	0
➕		1	3	0	0
		1	1	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 900+300
    Solution:
    900+300 = 1200
    Column vertical calculation:

			9	0	0
➕		1	3	0	0
		1	2	0	0

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>>注：本次最多计算 7 道题。

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