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: 50900×300
    Solution:
    50900×300 = 15270000
    Column vertical calculation:

								5	0	9	0	0
✖										3	0	0
								0	0	0	0	0
							0	0	0	0	0
					1	5	2	7	0	0
					1	5	2	7	0	0	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 7321×600
    Solution:
    7321×600 = 4392600
    Column vertical calculation:

								7	3	2	1
✖									6	0	0
								0	0	0	0
							0	0	0	0
					4	3	9	2	6
					4	3	9	2	6	0	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 12800÷320
    Solution:
    12800÷320 = 40
    Column vertical calculation:

							4	0
3	2	0	丿	1	2	8	0	0
				1	2	8	0
							0	0
								0
								0

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