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: 78×40
    Solution:
    78×40 = 3120
    Column vertical calculation:

							7	8
✖							4	0
							0	0
					3	1	2
					3	1	2	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 242×4
    Solution:
    242×4 = 968
    Column vertical calculation:

						2	4	2
✖								4
						9	6	8
						9	6	8

[3/3 Integer column vertical calculation]
    Question type: Integer division
    Original question: 450÷15
    Solution:
    450÷15 = 30
    Column vertical calculation:

				3	0
1	5	丿	4	5	0
			4	5
				0	0
					0
					0

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