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: 660+90
    Solution:
    660+90 = 750
    Column vertical calculation:

			6	6	0
➕			1	9	0
			7	5	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 240-80
    Solution:
    240-80 = 160
    Column vertical calculation:

			1
			2	4	0
➖				8	0
			1	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 320+400
    Solution:
    320+400 = 720
    Column vertical calculation:

			3	2	0
➕			4	0	0
			7	2	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 760+800
    Solution:
    760+800 = 1560
    Column vertical calculation:

			7	6	0
➕		1	8	0	0
		1	5	6	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 300-60
    Solution:
    300-60 = 240
    Column vertical calculation:

			1
			3	0	0
➖				6	0
			2	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 530-300
    Solution:
    530-300 = 230
    Column vertical calculation:

			5	3	0
➖			3	0	0
			2	3	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 560+900
    Solution:
    560+900 = 1460
    Column vertical calculation:

			5	6	0
➕		1	9	0	0
		1	4	6	0

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>>注：本次最多计算 7 道题。

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