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: 4407×600
    Solution:
    4407×600 = 2644200
    Column vertical calculation:

								4	4	0	7
✖									6	0	0
								0	0	0	0
							0	0	0	0
					2	6	4	4	2
					2	6	4	4	2	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 4038×600
    Solution:
    4038×600 = 2422800
    Column vertical calculation:

								4	0	3	8
✖									6	0	0
								0	0	0	0
							0	0	0	0
					2	4	2	2	8
					2	4	2	2	8	0	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 28800÷4800
    Solution:
    28800÷4800 = 6
    Column vertical calculation:

									6
4	8	0	0	丿	2	8	8	0	0
					2	8	8	0	0
									0

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