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: 790-200
    Solution:
    790-200 = 590
    Column vertical calculation:

			7	9	0
➖			2	0	0
			5	9	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 770-80
    Solution:
    770-80 = 690
    Column vertical calculation:

			1
			7	7	0
➖				8	0
			6	9	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 540-200
    Solution:
    540-200 = 340
    Column vertical calculation:

			5	4	0
➖			2	0	0
			3	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 590+50
    Solution:
    590+50 = 640
    Column vertical calculation:

			5	9	0
➕			1	5	0
			6	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 470-180
    Solution:
    470-180 = 290
    Column vertical calculation:

			1
			4	7	0
➖			1	8	0
			2	9	0

[6/7 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

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 790+300
    Solution:
    790+300 = 1090
    Column vertical calculation:

			7	9	0
➕		1	3	0	0
		1	0	9	0

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>>注：本次最多计算 7 道题。

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