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: 40×200
    Solution:
    40×200 = 8000
    Column vertical calculation:

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

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 164×20
    Solution:
    164×20 = 3280
    Column vertical calculation:

							1	6	4
✖								2	0
							0	0	0
						3	2	8
						3	2	8	0

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 4200÷70
    Solution:
    4200÷70 = 60
    Column vertical calculation:

					6	0
7	0	丿	4	2	0	0
			4	2	0
					0	0
						0
						0

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