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+100
    Solution:
    600+100 = 700
    Column vertical calculation:

			6	0	0
➕			1	0	0
			7	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 480-180
    Solution:
    480-180 = 300
    Column vertical calculation:

			4	8	0
➖			1	8	0
			3	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 460+400
    Solution:
    460+400 = 860
    Column vertical calculation:

			4	6	0
➕			4	0	0
			8	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 200+500
    Solution:
    200+500 = 700
    Column vertical calculation:

			2	0	0
➕			5	0	0
			7	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 240+260
    Solution:
    240+260 = 500
    Column vertical calculation:

			2	4	0
➕			21	6	0
			5	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 370-230
    Solution:
    370-230 = 140
    Column vertical calculation:

			3	7	0
➖			2	3	0
			1	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+120
    Solution:
    500+120 = 620
    Column vertical calculation:

			5	0	0
➕			1	2	0
			6	2	0

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>>注：本次最多计算 7 道题。

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