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: 65×20
    Solution:
    65×20 = 1300
    Column vertical calculation:

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

[2/6 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

[3/6 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

[4/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×20
    Solution:
    62×20 = 1240
    Column vertical calculation:

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

[5/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 65×2
    Solution:
    65×2 = 130
    Column vertical calculation:

						6	5
✖							2
					1	3	0
					1	3	0

[6/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×4
    Solution:
    62×4 = 248
    Column vertical calculation:

						6	2
✖							4
					2	4	8
					2	4	8

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