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: 123*456
    Solution:
    123*456 = 56088
    Column vertical calculation:

								1	2	3
✖								4	5	6
								7	3	8
							6	1	5
						4	9	2
						5	6	0	8	8

[2/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 123*465
    Solution:
    123*465 = 57195
    Column vertical calculation:

								1	2	3
✖								4	6	5
								6	1	5
							7	3	8
						4	9	2
						5	7	1	9	5

[3/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 123*546
    Solution:
    123*546 = 67158
    Column vertical calculation:

								1	2	3
✖								5	4	6
								7	3	8
							4	9	2
						6	1	5
						6	7	1	5	8

[4/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 123*564
    Solution:
    123*564 = 69372
    Column vertical calculation:

								1	2	3
✖								5	6	4
								4	9	2
							7	3	8
						6	1	5
						6	9	3	7	2

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