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+290
    Solution:
    600+290 = 890
    Column vertical calculation:

			6	0	0
➕			2	9	0
			8	9	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-380
    Solution:
    880-380 = 500
    Column vertical calculation:

			8	8	0
➖			3	8	0
			5	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 560+220
    Solution:
    560+220 = 780
    Column vertical calculation:

			5	6	0
➕			2	2	0
			7	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 790+10
    Solution:
    790+10 = 800
    Column vertical calculation:

			7	9	0
➕			1	1	0
			8	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 740-460
    Solution:
    740-460 = 280
    Column vertical calculation:

			1
			7	4	0
➖			4	6	0
			2	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 470-200
    Solution:
    470-200 = 270
    Column vertical calculation:

			4	7	0
➖			2	0	0
			2	7	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+110
    Solution:
    600+110 = 710
    Column vertical calculation:

			6	0	0
➕			1	1	0
			7	1	0

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>>注：本次最多计算 7 道题。

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