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: 600+500
    Solution:
    600+500 = 1100
    Column vertical calculation:

			6	0	0
➕		1	5	0	0
		1	1	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 620-200
    Solution:
    620-200 = 420
    Column vertical calculation:

			6	2	0
➖			2	0	0
			4	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 680-400
    Solution:
    680-400 = 280
    Column vertical calculation:

			6	8	0
➖			4	0	0
			2	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 180+500
    Solution:
    180+500 = 680
    Column vertical calculation:

			1	8	0
➕			5	0	0
			6	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+300
    Solution:
    660+300 = 960
    Column vertical calculation:

			6	6	0
➕			3	0	0
			9	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+600
    Solution:
    400+600 = 1000
    Column vertical calculation:

			4	0	0
➕		1	6	0	0
		1	0	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 900-400
    Solution:
    900-400 = 500
    Column vertical calculation:

			9	0	0
➖			4	0	0
			5	0	0

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>>注：本次最多计算 7 道题。

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