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: 205×60
    Solution:
    205×60 = 12300
    Column vertical calculation:

							2	0	5
✖								6	0
							0	0	0
					1	2	3	0
					1	2	3	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 134×20
    Solution:
    134×20 = 2680
    Column vertical calculation:

							1	3	4
✖								2	0
							0	0	0
						2	6	8
						2	6	8	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 1080÷40
    Solution:
    1080÷40 = 27
    Column vertical calculation:

					2	7
4	0	丿	1	0	8	0
				8	0
				2	8	0
				2	8	0
						0

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