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: 68×40
    Solution:
    68×40 = 2720
    Column vertical calculation:

							6	8
✖							4	0
							0	0
					2	7	2
					2	7	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 222×4
    Solution:
    222×4 = 888
    Column vertical calculation:

						2	2	2
✖								4
						8	8	8
						8	8	8

[3/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 3900÷130
    Solution:
    3900÷130 = 30
    Column vertical calculation:

						3	0
1	3	0	丿	3	9	0	0
				3	9	0
						0	0
							0
							0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×300
    Solution:
    22×300 = 6600
    Column vertical calculation:

								2	2
✖							3	0	0
								0	0
							0	0
						6	6
						6	6	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 131×50
    Solution:
    131×50 = 6550
    Column vertical calculation:

							1	3	1
✖								5	0
							0	0	0
						6	5	5
						6	5	5	0

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 1200÷40
    Solution:
    1200÷40 = 30
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 54×300
    Solution:
    54×300 = 16200
    Column vertical calculation:

								5	4
✖							3	0	0
								0	0
							0	0
					1	6	2
					1	6	2	0	0

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>>注：本次最多计算 7 道题。

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