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: 170-480
    Solution:
    170-480 = - (480 - 170) = - 310
    Column vertical calculation:

			4	8	0
➖			1	7	0
			3	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 780-280
    Solution:
    780-280 = 500
    Column vertical calculation:

			7	8	0
➖			2	8	0
			5	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 340-380
    Solution:
    340-380 = - (380 - 340) = - 40
    Column vertical calculation:

			3	8	0
➖			3	4	0
			0	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 120+680
    Solution:
    120+680 = 800
    Column vertical calculation:

			1	2	0
➕			61	8	0
			8	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 260+380
    Solution:
    260+380 = 640
    Column vertical calculation:

			2	6	0
➕			31	8	0
			6	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+680
    Solution:
    400+680 = 1080
    Column vertical calculation:

			4	0	0
➕		1	6	8	0
		1	0	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 900-780
    Solution:
    900-780 = 120
    Column vertical calculation:

			1
			9	0	0
➖			7	8	0
			1	2	0

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>>注：本次最多计算 7 道题。

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