Overview: 3 questions will be solved this time.Among them
           ☆3 integer calculations

[1/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 604×400
    Solution:
    604×400 = 241600
    Column vertical calculation:

								6	0	4
✖								4	0	0
								0	0	0
							0	0	0
					2	4	1	6
					2	4	1	6	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 5092×70
    Solution:
    5092×70 = 356440
    Column vertical calculation:

							5	0	9	2
✖									7	0
							0	0	0	0
					3	5	6	4	4
					3	5	6	4	4	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 4480÷560
    Solution:
    4480÷560 = 8
    Column vertical calculation:

							8
5	6	0	丿	4	4	8	0
				4	4	8	0
							0

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