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: 300000×6000
    Solution:
    300000×6000 = 1800000000
    Column vertical calculation:

									3	0	0	0	0	0
✖											6	0	0	0
									0	0	0	0	0	0
								0	0	0	0	0	0
							0	0	0	0	0	0
					1	8	0	0	0	0	0
					1	8	0	0	0	0	0	0	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 70000×6000
    Solution:
    70000×6000 = 420000000
    Column vertical calculation:

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

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 28600000÷5000
    Solution:
    28600000÷5000 = 5720
    Column vertical calculation:

									5	7	2	0
5	0	0	0	丿	2	8	6	0	0	0	0	0
					2	5	0	0	0
						3	6	0	0	0
						3	5	0	0	0
							1	0	0	0	0
							1	0	0	0	0
											0	0
												0
												0

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