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: 74×30
    Solution:
    74×30 = 2220
    Column vertical calculation:

							7	4
✖							3	0
							0	0
					2	2	2
					2	2	2	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 68×50
    Solution:
    68×50 = 3400
    Column vertical calculation:

							6	8
✖							5	0
							0	0
					3	4	0
					3	4	0	0

[3/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×40
    Solution:
    75×40 = 3000
    Column vertical calculation:

							7	5
✖							4	0
							0	0
					3	0	0
					3	0	0	0

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