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+370
    Solution:
    600+370 = 970
    Column vertical calculation:

			6	0	0
➕			3	7	0
			9	7	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-460
    Solution:
    880-460 = 420
    Column vertical calculation:

			8	8	0
➖			4	6	0
			4	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 560+300
    Solution:
    560+300 = 860
    Column vertical calculation:

			5	6	0
➕			3	0	0
			8	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 790+130
    Solution:
    790+130 = 920
    Column vertical calculation:

			7	9	0
➕			11	3	0
			9	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 740-540
    Solution:
    740-540 = 200
    Column vertical calculation:

			7	4	0
➖			5	4	0
			2	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 470-120
    Solution:
    470-120 = 350
    Column vertical calculation:

			4	7	0
➖			1	2	0
			3	5	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+230
    Solution:
    600+230 = 830
    Column vertical calculation:

			6	0	0
➕			2	3	0
			8	3	0

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>>注：本次最多计算 7 道题。

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