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: 540+500
    Solution:
    540+500 = 1040
    Column vertical calculation:

			5	4	0
➕		1	5	0	0
		1	0	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 560-200
    Solution:
    560-200 = 360
    Column vertical calculation:

			5	6	0
➖			2	0	0
			3	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 620-400
    Solution:
    620-400 = 220
    Column vertical calculation:

			6	2	0
➖			4	0	0
			2	2	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 140+500
    Solution:
    140+500 = 640
    Column vertical calculation:

			1	4	0
➕			5	0	0
			6	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+300
    Solution:
    600+300 = 900
    Column vertical calculation:

			6	0	0
➕			3	0	0
			9	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 340+600
    Solution:
    340+600 = 940
    Column vertical calculation:

			3	4	0
➕			6	0	0
			9	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 840-400
    Solution:
    840-400 = 440
    Column vertical calculation:

			8	4	0
➖			4	0	0
			4	4	0

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>>注：本次最多计算 7 道题。

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