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: 25*28
    Solution:
    25*28 = 700
    Column vertical calculation:

							2	5
✖							2	8
						2	0	0
						5	0
						7	0	0

[2/4 Integer column vertical calculation]
    Question type: Integer division
    Original question: 456/5
    Solution:
    456/5 = 91 ··· ··· 1
    Column vertical calculation:

			9	1
5	丿	4	5	6
		4	5
			0	6
				5
				1

[3/4 Integer column vertical calculation]
    Question type: Integer division
    Original question: 236/3
    Solution:
    236/3 = 78 ··· ··· 2
    Column vertical calculation:

			7	8
3	丿	2	3	6
		2	1
			2	6
			2	4
				2

[4/4 Integer column vertical calculation]
    Question type: Integer division
    Original question: 735/7
    Solution:
    735/7 = 105
    Column vertical calculation:

		1	0	5
7	丿	7	3	5
		7
		0	3	5
			3	5
				0

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