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: 700-500
    Solution:
    700-500 = 200
    Column vertical calculation:

			7	0	0
➖			5	0	0
			2	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 580-380
    Solution:
    580-380 = 200
    Column vertical calculation:

			5	8	0
➖			3	8	0
			2	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 640-500
    Solution:
    640-500 = 140
    Column vertical calculation:

			6	4	0
➖			5	0	0
			1	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+390
    Solution:
    400+390 = 790
    Column vertical calculation:

			4	0	0
➕			3	9	0
			7	9	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 180-180
    Solution:
    180-180 = 0
    Column vertical calculation:

			1	8	0
➖			1	8	0
			0	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 460+340
    Solution:
    460+340 = 800
    Column vertical calculation:

			4	6	0
➕			31	4	0
			8	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+300
    Solution:
    500+300 = 800
    Column vertical calculation:

			5	0	0
➕			3	0	0
			8	0	0

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>>注：本次最多计算 7 道题。

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