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: 6440×600
    Solution:
    6440×600 = 3864000
    Column vertical calculation:

								6	4	4	0
✖									6	0	0
								0	0	0	0
							0	0	0	0
					3	8	6	4	0
					3	8	6	4	0	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60308×30
    Solution:
    60308×30 = 1809240
    Column vertical calculation:

							6	0	3	0	8
✖										3	0
							0	0	0	0	0
					1	8	0	9	2	4
					1	8	0	9	2	4	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 48000÷6000
    Solution:
    48000÷6000 = 8
    Column vertical calculation:

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

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