Overview: 4 questions will be solved this time.Among them
           ☆4 integer calculations

[1/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 989*6
    Solution:
    989*6 = 5934
    Column vertical calculation:

						9	8	9
✖								6
					5	9	3	4
					5	9	3	4

[2/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 888*8
    Solution:
    888*8 = 7104
    Column vertical calculation:

						8	8	8
✖								8
					7	1	0	4
					7	1	0	4

[3/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 635*2
    Solution:
    635*2 = 1270
    Column vertical calculation:

						6	3	5
✖								2
					1	2	7	0
					1	2	7	0

[4/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 542*3
    Solution:
    542*3 = 1626
    Column vertical calculation:

						5	4	2
✖								3
					1	6	2	6
					1	6	2	6

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