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: 53×40
    Solution:
    53×40 = 2120
    Column vertical calculation:

							5	3
✖							4	0
							0	0
					2	1	2
					2	1	2	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 192×4
    Solution:
    192×4 = 768
    Column vertical calculation:

						1	9	2
✖								4
						7	6	8
						7	6	8

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 200÷10
    Solution:
    200÷10 = 20
    Column vertical calculation:

				2	0
1	0	丿	2	0	0
			2	0
				0	0
					0
					0

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