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: 900-400
    Solution:
    900-400 = 500
    Column vertical calculation:

			9	0	0
➖			4	0	0
			5	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 780-280
    Solution:
    780-280 = 500
    Column vertical calculation:

			7	8	0
➖			2	8	0
			5	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 840-400
    Solution:
    840-400 = 440
    Column vertical calculation:

			8	4	0
➖			4	0	0
			4	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+290
    Solution:
    600+290 = 890
    Column vertical calculation:

			6	0	0
➕			2	9	0
			8	9	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+240
    Solution:
    660+240 = 900
    Column vertical calculation:

			6	6	0
➕			21	4	0
			9	0	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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