Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 150+490
    Solution:
    150+490 = 640
    Column vertical calculation:

			1	5	0
➕			41	9	0
			6	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 320-100
    Solution:
    320-100 = 220
    Column vertical calculation:

			3	2	0
➖			1	0	0
			2	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 680-230
    Solution:
    680-230 = 450
    Column vertical calculation:

			6	8	0
➖			2	3	0
			4	5	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 420+200
    Solution:
    420+200 = 620
    Column vertical calculation:

			4	2	0
➕			2	0	0
			6	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 160+330
    Solution:
    160+330 = 490
    Column vertical calculation:

			1	6	0
➕			3	3	0
			4	9	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 240+560
    Solution:
    240+560 = 800
    Column vertical calculation:

			2	4	0
➕			51	6	0
			8	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 680-670
    Solution:
    680-670 = 10
    Column vertical calculation:

			6	8	0
➖			6	7	0
			0	1	0

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>>注：本次最多计算 7 道题。

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