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: 72×500
    Solution:
    72×500 = 36000
    Column vertical calculation:

								7	2
✖							5	0	0
								0	0
							0	0
					3	6	0
					3	6	0	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 231×50
    Solution:
    231×50 = 11550
    Column vertical calculation:

							2	3	1
✖								5	0
							0	0	0
					1	1	5	5
					1	1	5	5	0

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 2100÷140
    Solution:
    2100÷140 = 15
    Column vertical calculation:

						1	5
1	4	0	丿	2	1	0	0
				1	4	0
					7	0	0
					7	0	0
							0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 709×30
    Solution:
    709×30 = 21270
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 243×30
    Solution:
    243×30 = 7290
    Column vertical calculation:

							2	4	3
✖								3	0
							0	0	0
						7	2	9
						7	2	9	0

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 6000÷150
    Solution:
    6000÷150 = 40
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 61×60
    Solution:
    61×60 = 3660
    Column vertical calculation:

							6	1
✖							6	0
							0	0
					3	6	6
					3	6	6	0

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>>注：本次最多计算 7 道题。

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