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: 790+110
    Solution:
    790+110 = 900
    Column vertical calculation:

			7	9	0
➕			11	1	0
			9	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 740-560
    Solution:
    740-560 = 180
    Column vertical calculation:

			1
			7	4	0
➖			5	6	0
			1	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 470-100
    Solution:
    470-100 = 370
    Column vertical calculation:

			4	7	0
➖			1	0	0
			3	7	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+210
    Solution:
    600+210 = 810
    Column vertical calculation:

			6	0	0
➕			2	1	0
			8	1	0

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>>注：本次最多计算 7 道题。

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