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: 85×60
    Solution:
    85×60 = 5100
    Column vertical calculation:

							8	5
✖							6	0
							0	0
					5	1	0
					5	1	0	0

[2/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 67×20
    Solution:
    67×20 = 1340
    Column vertical calculation:

							6	7
✖							2	0
							0	0
					1	3	4
					1	3	4	0

[3/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×50
    Solution:
    62×50 = 3100
    Column vertical calculation:

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

[4/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 72×20
    Solution:
    72×20 = 1440
    Column vertical calculation:

							7	2
✖							2	0
							0	0
					1	4	4
					1	4	4	0

[5/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 85×6
    Solution:
    85×6 = 510
    Column vertical calculation:

						8	5
✖							6
					5	1	0
					5	1	0

[6/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 67×2
    Solution:
    67×2 = 134
    Column vertical calculation:

						6	7
✖							2
					1	3	4
					1	3	4

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