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: 640+100
    Solution:
    640+100 = 740
    Column vertical calculation:

			6	4	0
➕			1	0	0
			7	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-180
    Solution:
    520-180 = 340
    Column vertical calculation:

			1
			5	2	0
➖			1	8	0
			3	4	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+400
    Solution:
    500+400 = 900
    Column vertical calculation:

			5	0	0
➕			4	0	0
			9	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 240+500
    Solution:
    240+500 = 740
    Column vertical calculation:

			2	4	0
➕			5	0	0
			7	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 280+260
    Solution:
    280+260 = 540
    Column vertical calculation:

			2	8	0
➕			21	6	0
			5	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 410-230
    Solution:
    410-230 = 180
    Column vertical calculation:

			1
			4	1	0
➖			2	3	0
			1	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 540+120
    Solution:
    540+120 = 660
    Column vertical calculation:

			5	4	0
➕			1	2	0
			6	6	0

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>>注：本次最多计算 7 道题。

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