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: 600+90
    Solution:
    600+90 = 690
    Column vertical calculation:

			6	0	0
➕				9	0
			6	9	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 180-80
    Solution:
    180-80 = 100
    Column vertical calculation:

			1	8	0
➖				8	0
			1	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 260+400
    Solution:
    260+400 = 660
    Column vertical calculation:

			2	6	0
➕			4	0	0
			6	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+800
    Solution:
    700+800 = 1500
    Column vertical calculation:

			7	0	0
➕		1	8	0	0
		1	5	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 240-60
    Solution:
    240-60 = 180
    Column vertical calculation:

			1
			2	4	0
➖				6	0
			1	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 470-300
    Solution:
    470-300 = 170
    Column vertical calculation:

			4	7	0
➖			3	0	0
			1	7	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+900
    Solution:
    500+900 = 1400
    Column vertical calculation:

			5	0	0
➕		1	9	0	0
		1	4	0	0

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>>注：本次最多计算 7 道题。

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