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: 700-400
    Solution:
    700-400 = 300
    Column vertical calculation:

			7	0	0
➖			4	0	0
			3	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 680-280
    Solution:
    680-280 = 400
    Column vertical calculation:

			6	8	0
➖			2	8	0
			4	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 440-400
    Solution:
    440-400 = 40
    Column vertical calculation:

			4	4	0
➖			4	0	0
			0	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+250
    Solution:
    500+250 = 750
    Column vertical calculation:

			5	0	0
➕			2	5	0
			7	5	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 380-280
    Solution:
    380-280 = 100
    Column vertical calculation:

			3	8	0
➖			2	8	0
			1	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+100
    Solution:
    660+100 = 760
    Column vertical calculation:

			6	6	0
➕			1	0	0
			7	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+100
    Solution:
    700+100 = 800
    Column vertical calculation:

			7	0	0
➕			1	0	0
			8	0	0

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>>注：本次最多计算 7 道题。

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