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: 67×50
    Solution:
    67×50 = 3350
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 221×5
    Solution:
    221×5 = 1105
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 2600÷130
    Solution:
    2600÷130 = 20
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 509×30
    Solution:
    509×30 = 15270
    Column vertical calculation:

							5	0	9
✖								3	0
							0	0	0
					1	5	2	7
					1	5	2	7	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 183×30
    Solution:
    183×30 = 5490
    Column vertical calculation:

							1	8	3
✖								3	0
							0	0	0
						5	4	9
						5	4	9	0

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 4500÷90
    Solution:
    4500÷90 = 50
    Column vertical calculation:

					5	0
9	0	丿	4	5	0	0
			4	5	0
					0	0
						0
						0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 210×20
    Solution:
    210×20 = 4200
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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