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: 390÷13
    Solution:
    390÷13 = 30
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 95×20
    Solution:
    95×20 = 1900
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 274×2
    Solution:
    274×2 = 548
    Column vertical calculation:

						2	7	4
✖								2
						5	4	8
						5	4	8

[6/7 Integer column vertical calculation]
    Question type: Integer division
    Original question: 540÷18
    Solution:
    540÷18 = 30
    Column vertical calculation:

				3	0
1	8	丿	5	4	0
			5	4
				0	0
					0
					0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 77×50
    Solution:
    77×50 = 3850
    Column vertical calculation:

							7	7
✖							5	0
							0	0
					3	8	5
					3	8	5	0

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>>注：本次最多计算 7 道题。

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