Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×20
    Solution:
    75×20 = 1500
    Column vertical calculation:

							7	5
✖							2	0
							0	0
					1	5	0
					1	5	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 234×2
    Solution:
    234×2 = 468
    Column vertical calculation:

						2	3	4
✖								2
						4	6	8
						4	6	8

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 420÷14
    Solution:
    420÷14 = 30
    Column vertical calculation:

				3	0
1	4	丿	4	2	0
			4	2
				0	0
					0
					0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 69×30
    Solution:
    69×30 = 2070
    Column vertical calculation:

							6	9
✖							3	0
							0	0
					2	0	7
					2	0	7	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 223×3
    Solution:
    223×3 = 669
    Column vertical calculation:

						2	2	3
✖								3
						6	6	9
						6	6	9

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 520÷13
    Solution:
    520÷13 = 40
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 88×40
    Solution:
    88×40 = 3520
    Column vertical calculation:

							8	8
✖							4	0
							0	0
					3	5	2
					3	5	2	0

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>>注：本次最多计算 7 道题。

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