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: 700-280
    Solution:
    700-280 = 420
    Column vertical calculation:

			1
			7	0	0
➖			2	8	0
			4	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 680-160
    Solution:
    680-160 = 520
    Column vertical calculation:

			6	8	0
➖			1	6	0
			5	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 440-280
    Solution:
    440-280 = 160
    Column vertical calculation:

			1
			4	4	0
➖			2	8	0
			1	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+130
    Solution:
    500+130 = 630
    Column vertical calculation:

			5	0	0
➕			1	3	0
			6	3	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 380-260
    Solution:
    380-260 = 120
    Column vertical calculation:

			3	8	0
➖			2	6	0
			1	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+380
    Solution:
    660+380 = 1040
    Column vertical calculation:

			6	6	0
➕		1	31	8	0
		1	0	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+380
    Solution:
    700+380 = 1080
    Column vertical calculation:

			7	0	0
➕		1	3	8	0
		1	0	8	0

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>>注：本次最多计算 7 道题。

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