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: 6400×200
    Solution:
    6400×200 = 1280000
    Column vertical calculation:

								6	4	0	0
✖									2	0	0
								0	0	0	0
							0	0	0	0
					1	2	8	0	0
					1	2	8	0	0	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 8234×70
    Solution:
    8234×70 = 576380
    Column vertical calculation:

							8	2	3	4
✖									7	0
							0	0	0	0
					5	7	6	3	8
					5	7	6	3	8	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 3520÷320
    Solution:
    3520÷320 = 11
    Column vertical calculation:

						1	1
3	2	0	丿	3	5	2	0
				3	2	0
					3	2	0
					3	2	0
							0

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