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: 750-200
    Solution:
    750-200 = 550
    Column vertical calculation:

			7	5	0
➖			2	0	0
			5	5	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 730-80
    Solution:
    730-80 = 650
    Column vertical calculation:

			1
			7	3	0
➖				8	0
			6	5	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 490-200
    Solution:
    490-200 = 290
    Column vertical calculation:

			4	9	0
➖			2	0	0
			2	9	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 550+50
    Solution:
    550+50 = 600
    Column vertical calculation:

			5	5	0
➕			1	5	0
			6	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 420-180
    Solution:
    420-180 = 240
    Column vertical calculation:

			1
			4	2	0
➖			1	8	0
			2	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 710+300
    Solution:
    710+300 = 1010
    Column vertical calculation:

			7	1	0
➕		1	3	0	0
		1	0	1	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 750+300
    Solution:
    750+300 = 1050
    Column vertical calculation:

			7	5	0
➕		1	3	0	0
		1	0	5	0

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>>注：本次最多计算 7 道题。

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