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: 170-400
    Solution:
    170-400 = - (400 - 170) = - 230
    Column vertical calculation:

			1
			4	0	0
➖			1	7	0
			2	3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 780-200
    Solution:
    780-200 = 580
    Column vertical calculation:

			7	8	0
➖			2	0	0
			5	8	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 340-300
    Solution:
    340-300 = 40
    Column vertical calculation:

			3	4	0
➖			3	0	0
			0	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 120+600
    Solution:
    120+600 = 720
    Column vertical calculation:

			1	2	0
➕			6	0	0
			7	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 260+300
    Solution:
    260+300 = 560
    Column vertical calculation:

			2	6	0
➕			3	0	0
			5	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+600
    Solution:
    400+600 = 1000
    Column vertical calculation:

			4	0	0
➕		1	6	0	0
		1	0	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 900-700
    Solution:
    900-700 = 200
    Column vertical calculation:

			9	0	0
➖			7	0	0
			2	0	0

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>>注：本次最多计算 7 道题。

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