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: 38000×60000
    Solution:
    38000×60000 = 2280000000
    Column vertical calculation:

										3	8	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	0	0	0
					2	2	8	0	0	0
					2	2	8	0	0	0	0	0	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 78000×60000
    Solution:
    78000×60000 = 4680000000
    Column vertical calculation:

										7	8	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	0	0	0
					4	6	8	0	0	0
					4	6	8	0	0	0	0	0	0	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 2800÷700
    Solution:
    2800÷700 = 4
    Column vertical calculation:

							4
7	0	0	丿	2	8	0	0
				2	8	0	0
							0

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