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+390
    Solution:
    600+390 = 990
    Column vertical calculation:

			6	0	0
➕			3	9	0
			9	9	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-480
    Solution:
    880-480 = 400
    Column vertical calculation:

			8	8	0
➖			4	8	0
			4	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 560+320
    Solution:
    560+320 = 880
    Column vertical calculation:

			5	6	0
➕			3	2	0
			8	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 590+110
    Solution:
    590+110 = 700
    Column vertical calculation:

			5	9	0
➕			11	1	0
			7	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 540-460
    Solution:
    540-460 = 80
    Column vertical calculation:

			1
			5	4	0
➖			4	6	0
			0	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 270-100
    Solution:
    270-100 = 170
    Column vertical calculation:

			2	7	0
➖			1	0	0
			1	7	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+210
    Solution:
    400+210 = 610
    Column vertical calculation:

			4	0	0
➕			2	1	0
			6	1	0

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>>注：本次最多计算 7 道题。

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