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: 209×50
    Solution:
    209×50 = 10450
    Column vertical calculation:

							2	0	9
✖								5	0
							0	0	0
					1	0	4	5
					1	0	4	5	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 143×30
    Solution:
    143×30 = 4290
    Column vertical calculation:

							1	4	3
✖								3	0
							0	0	0
						4	2	9
						4	2	9	0

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 1300÷50
    Solution:
    1300÷50 = 26
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 30×600
    Solution:
    30×600 = 18000
    Column vertical calculation:

								3	0
✖							6	0	0
								0	0
							0	0
					1	8	0
					1	8	0	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 144×20
    Solution:
    144×20 = 2880
    Column vertical calculation:

							1	4	4
✖								2	0
							0	0	0
						2	8	8
						2	8	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 1400÷50
    Solution:
    1400÷50 = 28
    Column vertical calculation:

					2	8
5	0	丿	1	4	0	0
			1	0	0
				4	0	0
				4	0	0
						0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 1040×30
    Solution:
    1040×30 = 31200
    Column vertical calculation:

							1	0	4	0
✖									3	0
							0	0	0	0
						3	1	2	0
						3	1	2	0	0

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>>注：本次最多计算 7 道题。

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