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: 4590×500
    Solution:
    4590×500 = 2295000
    Column vertical calculation:

								4	5	9	0
✖									5	0	0
								0	0	0	0
							0	0	0	0
					2	2	9	5	0
					2	2	9	5	0	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40420×50
    Solution:
    40420×50 = 2021000
    Column vertical calculation:

							4	0	4	2	0
✖										5	0
							0	0	0	0	0
					2	0	2	1	0	0
					2	0	2	1	0	0	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 57600÷480
    Solution:
    57600÷480 = 120
    Column vertical calculation:

						1	2	0
4	8	0	丿	5	7	6	0	0
				4	8	0
					9	6	0
					9	6	0
							0	0
								0
								0

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