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: 700-100
    Solution:
    700-100 = 600
    Column vertical calculation:

			7	0	0
➖			1	0	0
			6	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 680-180
    Solution:
    680-180 = 500
    Column vertical calculation:

			6	8	0
➖			1	8	0
			5	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 440-100
    Solution:
    440-100 = 340
    Column vertical calculation:

			4	4	0
➖			1	0	0
			3	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+150
    Solution:
    500+150 = 650
    Column vertical calculation:

			5	0	0
➕			1	5	0
			6	5	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 380-80
    Solution:
    380-80 = 300
    Column vertical calculation:

			3	8	0
➖				8	0
			3	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+200
    Solution:
    660+200 = 860
    Column vertical calculation:

			6	6	0
➕			2	0	0
			8	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+200
    Solution:
    700+200 = 900
    Column vertical calculation:

			7	0	0
➕			2	0	0
			9	0	0

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>>注：本次最多计算 7 道题。

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