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: 107×30
    Solution:
    107×30 = 3210
    Column vertical calculation:

							1	0	7
✖								3	0
							0	0	0
						3	2	1
						3	2	1	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 121×50
    Solution:
    121×50 = 6050
    Column vertical calculation:

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

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 1050÷30
    Solution:
    1050÷30 = 35
    Column vertical calculation:

					3	5
3	0	丿	1	0	5	0
				9	0
				1	5	0
				1	5	0
						0

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