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: 3800×80000
    Solution:
    3800×80000 = 304000000
    Column vertical calculation:

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

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28000×80000
    Solution:
    28000×80000 = 2240000000
    Column vertical calculation:

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

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 56800000÷8000
    Solution:
    56800000÷8000 = 7100
    Column vertical calculation:

									7	1	0	0
8	0	0	0	丿	5	6	8	0	0	0	0	0
					5	6	0	0	0
							8	0	0	0
							8	0	0	0
										0	0	0
												0
												0

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