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: 170-300
    Solution:
    170-300 = - (300 - 170) = - 130
    Column vertical calculation:

			1
			3	0	0
➖			1	7	0
			1	3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 780-100
    Solution:
    780-100 = 680
    Column vertical calculation:

			7	8	0
➖			1	0	0
			6	8	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 340-200
    Solution:
    340-200 = 140
    Column vertical calculation:

			3	4	0
➖			2	0	0
			1	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 120+500
    Solution:
    120+500 = 620
    Column vertical calculation:

			1	2	0
➕			5	0	0
			6	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 260+200
    Solution:
    260+200 = 460
    Column vertical calculation:

			2	6	0
➕			2	0	0
			4	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+500
    Solution:
    400+500 = 900
    Column vertical calculation:

			4	0	0
➕			5	0	0
			9	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 900-600
    Solution:
    900-600 = 300
    Column vertical calculation:

			9	0	0
➖			6	0	0
			3	0	0

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>>注：本次最多计算 7 道题。

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