Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 250+490
    Solution:
    250+490 = 740
    Column vertical calculation:

			2	5	0
➕			41	9	0
			7	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-100
    Solution:
    520-100 = 420
    Column vertical calculation:

			5	2	0
➖			1	0	0
			4	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-230
    Solution:
    880-230 = 650
    Column vertical calculation:

			8	8	0
➖			2	3	0
			6	5	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 620+200
    Solution:
    620+200 = 820
    Column vertical calculation:

			6	2	0
➕			2	0	0
			8	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 360+330
    Solution:
    360+330 = 690
    Column vertical calculation:

			3	6	0
➕			3	3	0
			6	9	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 440+560
    Solution:
    440+560 = 1000
    Column vertical calculation:

			4	4	0
➕		1	51	6	0
		1	0	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 880-770
    Solution:
    880-770 = 110
    Column vertical calculation:

			8	8	0
➖			7	7	0
			1	1	0

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>>注：本次最多计算 7 道题。

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