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: 220-400
    Solution:
    220-400 = - (400 - 220) = - 180
    Column vertical calculation:

			1
			4	0	0
➖			2	2	0
			1	8	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 830-200
    Solution:
    830-200 = 630
    Column vertical calculation:

			8	3	0
➖			2	0	0
			6	3	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 390-300
    Solution:
    390-300 = 90
    Column vertical calculation:

			3	9	0
➖			3	0	0
			0	9	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 170+600
    Solution:
    170+600 = 770
    Column vertical calculation:

			1	7	0
➕			6	0	0
			7	7	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 310+300
    Solution:
    310+300 = 610
    Column vertical calculation:

			3	1	0
➕			3	0	0
			6	1	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 450+600
    Solution:
    450+600 = 1050
    Column vertical calculation:

			4	5	0
➕		1	6	0	0
		1	0	5	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 950-700
    Solution:
    950-700 = 250
    Column vertical calculation:

			9	5	0
➖			7	0	0
			2	5	0

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>>注：本次最多计算 7 道题。

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