Overview: 6 questions will be solved this time.Among them
           ☆6 integer calculations

[1/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 64×2
    Solution:
    64×2 = 128
    Column vertical calculation:

						6	4
✖							2
					1	2	8
					1	2	8

[2/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×2
    Solution:
    62×2 = 124
    Column vertical calculation:

						6	2
✖							2
					1	2	4
					1	2	4

[3/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 65×20
    Solution:
    65×20 = 1300
    Column vertical calculation:

							6	5
✖							2	0
							0	0
					1	3	0
					1	3	0	0

[4/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×40
    Solution:
    62×40 = 2480
    Column vertical calculation:

							6	2
✖							4	0
							0	0
					2	4	8
					2	4	8	0

[5/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 64×20
    Solution:
    64×20 = 1280
    Column vertical calculation:

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

[6/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×60
    Solution:
    62×60 = 3720
    Column vertical calculation:

							6	2
✖							6	0
							0	0
					3	7	2
					3	7	2	0

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