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: 800+100
    Solution:
    800+100 = 900
    Column vertical calculation:

			8	0	0
➕			1	0	0
			9	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 680-180
    Solution:
    680-180 = 500
    Column vertical calculation:

			6	8	0
➖			1	8	0
			5	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+400
    Solution:
    660+400 = 1060
    Column vertical calculation:

			6	6	0
➕		1	4	0	0
		1	0	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+500
    Solution:
    400+500 = 900
    Column vertical calculation:

			4	0	0
➕			5	0	0
			9	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 440+260
    Solution:
    440+260 = 700
    Column vertical calculation:

			4	4	0
➕			21	6	0
			7	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 570-230
    Solution:
    570-230 = 340
    Column vertical calculation:

			5	7	0
➖			2	3	0
			3	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+120
    Solution:
    700+120 = 820
    Column vertical calculation:

			7	0	0
➕			1	2	0
			8	2	0

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>>注：本次最多计算 7 道题。

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