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: 300×80000
    Solution:
    300×80000 = 24000000
    Column vertical calculation:

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

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2000×80000
    Solution:
    2000×80000 = 160000000
    Column vertical calculation:

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

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 5600000÷8000
    Solution:
    5600000÷8000 = 700
    Column vertical calculation:

									7	0	0
8	0	0	0	丿	5	6	0	0	0	0	0
					5	6	0	0	0
									0	0	0
											0
											0

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