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: 910-420
    Solution:
    910-420 = 490
    Column vertical calculation:

			1
			9	1	0
➖			4	2	0
			4	9	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 480-360
    Solution:
    480-360 = 120
    Column vertical calculation:

			4	8	0
➖			3	6	0
			1	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 540-400
    Solution:
    540-400 = 140
    Column vertical calculation:

			5	4	0
➖			4	0	0
			1	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 610+170
    Solution:
    610+170 = 780
    Column vertical calculation:

			6	1	0
➕			1	7	0
			7	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 280-160
    Solution:
    280-160 = 120
    Column vertical calculation:

			2	8	0
➖			1	6	0
			1	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+100
    Solution:
    660+100 = 760
    Column vertical calculation:

			6	6	0
➕			1	0	0
			7	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 270+820
    Solution:
    270+820 = 1090
    Column vertical calculation:

			2	7	0
➕		1	8	2	0
		1	0	9	0

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>>注：本次最多计算 7 道题。

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