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: 17×50
    Solution:
    17×50 = 850
    Column vertical calculation:

							1	7
✖							5	0
							0	0
						8	5
						8	5	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 27×20
    Solution:
    27×20 = 540
    Column vertical calculation:

							2	7
✖							2	0
							0	0
						5	4
						5	4	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×600
    Solution:
    40×600 = 24000
    Column vertical calculation:

								4	0
✖							6	0	0
								0	0
							0	0
					2	4	0
					2	4	0	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×200
    Solution:
    23×200 = 4600
    Column vertical calculation:

								2	3
✖							2	0	0
								0	0
							0	0
						4	6
						4	6	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×500
    Solution:
    17×500 = 8500
    Column vertical calculation:

								1	7
✖							5	0	0
								0	0
							0	0
						8	5
						8	5	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 27×200
    Solution:
    27×200 = 5400
    Column vertical calculation:

								2	7
✖							2	0	0
								0	0
							0	0
						5	4
						5	4	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×4
    Solution:
    20×4 = 80
    Column vertical calculation:

						2	0
✖							4
						8	0
						8	0

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>>注：本次最多计算 7 道题。

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