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: 400-200
    Solution:
    400-200 = 200
    Column vertical calculation:

			4	0	0
➖			2	0	0
			2	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 810-200
    Solution:
    810-200 = 610
    Column vertical calculation:

			8	1	0
➖			2	0	0
			6	1	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 370-300
    Solution:
    370-300 = 70
    Column vertical calculation:

			3	7	0
➖			3	0	0
			0	7	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 150+600
    Solution:
    150+600 = 750
    Column vertical calculation:

			1	5	0
➕			6	0	0
			7	5	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 290+300
    Solution:
    290+300 = 590
    Column vertical calculation:

			2	9	0
➕			3	0	0
			5	9	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 430+600
    Solution:
    430+600 = 1030
    Column vertical calculation:

			4	3	0
➕		1	6	0	0
		1	0	3	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 930-700
    Solution:
    930-700 = 230
    Column vertical calculation:

			9	3	0
➖			7	0	0
			2	3	0

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>>注：本次最多计算 7 道题。

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