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: 31×3
    Solution:
    31×3 = 93
    Column vertical calculation:

						3	1
✖							3
						9	3
						9	3

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×20
    Solution:
    18×20 = 360
    Column vertical calculation:

							1	8
✖							2	0
							0	0
						3	6
						3	6	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×60
    Solution:
    40×60 = 2400
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×20
    Solution:
    31×20 = 620
    Column vertical calculation:

							3	1
✖							2	0
							0	0
						6	2
						6	2	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×30
    Solution:
    31×30 = 930
    Column vertical calculation:

							3	1
✖							3	0
							0	0
						9	3
						9	3	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×200
    Solution:
    18×200 = 3600
    Column vertical calculation:

								1	8
✖							2	0	0
								0	0
							0	0
						3	6
						3	6	0	0

[7/7 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

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>>注：本次最多计算 7 道题。

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