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

[1/4 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 123+456
    Solution:
    123+456 = 579
    Column vertical calculation:

			1	2	3
➕			4	5	6
			5	7	9

[2/4 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 123-456
    Solution:
    123-456 = - (456 - 123) = - 333
    Column vertical calculation:

			4	5	6
➖			1	2	3
			3	3	3

[3/4 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

[4/4 Integer column vertical calculation]
    Question type: Integer division
    Original question: 123/456
    Solution:
    123/456 = 0 ··· ··· 123
    Column vertical calculation:

						0
4	5	6	丿	1	2	3
						0
				1	2	3

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