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: 508×40
    Solution:
    508×40 = 20320
    Column vertical calculation:

							5	0	8
✖								4	0
							0	0	0
					2	0	3	2
					2	0	3	2	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 202×40
    Solution:
    202×40 = 8080
    Column vertical calculation:

							2	0	2
✖								4	0
							0	0	0
						8	0	8
						8	0	8	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 3300÷110
    Solution:
    3300÷110 = 30
    Column vertical calculation:

						3	0
1	1	0	丿	3	3	0	0
				3	3	0
						0	0
							0
							0

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