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: 370-400
    Solution:
    370-400 = - (400 - 370) = - 30
    Column vertical calculation:

			1
			4	0	0
➖			3	7	0
			0	3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 980-200
    Solution:
    980-200 = 780
    Column vertical calculation:

			9	8	0
➖			2	0	0
			7	8	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 540-300
    Solution:
    540-300 = 240
    Column vertical calculation:

			5	4	0
➖			3	0	0
			2	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 320+600
    Solution:
    320+600 = 920
    Column vertical calculation:

			3	2	0
➕			6	0	0
			9	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 460+300
    Solution:
    460+300 = 760
    Column vertical calculation:

			4	6	0
➕			3	0	0
			7	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+600
    Solution:
    600+600 = 1200
    Column vertical calculation:

			6	0	0
➕		1	6	0	0
		1	2	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 700-700
    Solution:
    700-700 = 0
    Column vertical calculation:

			7	0	0
➖			7	0	0
			0	0	0

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>>注：本次最多计算 7 道题。

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