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: 58*79
    Solution:
    58*79 = 4582
    Column vertical calculation:

							5	8
✖							7	9
						5	2	2
					4	0	6
					4	5	8	2

[2/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 39*28
    Solution:
    39*28 = 1092
    Column vertical calculation:

							3	9
✖							2	8
						3	1	2
						7	8
					1	0	9	2

[3/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 46*72
    Solution:
    46*72 = 3312
    Column vertical calculation:

							4	6
✖							7	2
							9	2
					3	2	2
					3	3	1	2

[4/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 37*68
    Solution:
    37*68 = 2516
    Column vertical calculation:

							3	7
✖							6	8
						2	9	6
					2	2	2
					2	5	1	6

[5/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 88*66
    Solution:
    88*66 = 5808
    Column vertical calculation:

							8	8
✖							6	6
						5	2	8
					5	2	8
					5	8	0	8

[6/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 97*23
    Solution:
    97*23 = 2231
    Column vertical calculation:

							9	7
✖							2	3
						2	9	1
					1	9	4
					2	2	3	1

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