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: 270-400
    Solution:
    270-400 = - (400 - 270) = - 130
    Column vertical calculation:

			1
			4	0	0
➖			2	7	0
			1	3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-200
    Solution:
    880-200 = 680
    Column vertical calculation:

			8	8	0
➖			2	0	0
			6	8	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 440-300
    Solution:
    440-300 = 140
    Column vertical calculation:

			4	4	0
➖			3	0	0
			1	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 220+600
    Solution:
    220+600 = 820
    Column vertical calculation:

			2	2	0
➕			6	0	0
			8	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 360+300
    Solution:
    360+300 = 660
    Column vertical calculation:

			3	6	0
➕			3	0	0
			6	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+600
    Solution:
    500+600 = 1100
    Column vertical calculation:

			5	0	0
➕		1	6	0	0
		1	1	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-700
    Solution:
    800-700 = 100
    Column vertical calculation:

			8	0	0
➖			7	0	0
			1	0	0

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>>注：本次最多计算 7 道题。

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