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: 41×60
    Solution:
    41×60 = 2460
    Column vertical calculation:

							4	1
✖							6	0
							0	0
					2	4	6
					2	4	6	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 170×6
    Solution:
    170×6 = 1020
    Column vertical calculation:

						1	7	0
✖								6
					1	0	2	0
					1	0	2	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 120÷8
    Solution:
    120÷8 = 15
    Column vertical calculation:

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

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