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: 910-300
    Solution:
    910-300 = 610
    Column vertical calculation:

			9	1	0
➖			3	0	0
			6	1	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 480-280
    Solution:
    480-280 = 200
    Column vertical calculation:

			4	8	0
➖			2	8	0
			2	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 540-320
    Solution:
    540-320 = 220
    Column vertical calculation:

			5	4	0
➖			3	2	0
			2	2	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 610+90
    Solution:
    610+90 = 700
    Column vertical calculation:

			6	1	0
➕			1	9	0
			7	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 280-80
    Solution:
    280-80 = 200
    Column vertical calculation:

			2	8	0
➖				8	0
			2	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+20
    Solution:
    660+20 = 680
    Column vertical calculation:

			6	6	0
➕				2	0
			6	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 270+700
    Solution:
    270+700 = 970
    Column vertical calculation:

			2	7	0
➕			7	0	0
			9	7	0

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>>注：本次最多计算 7 道题。

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