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: 105×20
    Solution:
    105×20 = 2100
    Column vertical calculation:

							1	0	5
✖								2	0
							0	0	0
						2	1	0
						2	1	0	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 294×2
    Solution:
    294×2 = 588
    Column vertical calculation:

						2	9	4
✖								2
						5	8	8
						5	8	8

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 560÷20
    Solution:
    560÷20 = 28
    Column vertical calculation:

				2	8
2	0	丿	5	6	0
			4	0
			1	6	0
			1	6	0
					0

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