Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 710-400
    Solution:
    710-400 = 310
    Column vertical calculation:

			7	1	0
➖			4	0	0
			3	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 280-380
    Solution:
    280-380 = - (380 - 280) = - 100
    Column vertical calculation:

			3	8	0
➖			2	8	0
			1	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 340-420
    Solution:
    340-420 = - (420 - 340) = - 80
    Column vertical calculation:

			1
			4	2	0
➖			3	4	0
			0	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 410+190
    Solution:
    410+190 = 600
    Column vertical calculation:

			4	1	0
➕			11	9	0
			6	0	0

[5/7 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

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 460+120
    Solution:
    460+120 = 580
    Column vertical calculation:

			4	6	0
➕			1	2	0
			5	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 470+800
    Solution:
    470+800 = 1270
    Column vertical calculation:

			4	7	0
➕		1	8	0	0
		1	2	7	0

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>>注：本次最多计算 7 道题。

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