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: 23×20
    Solution:
    23×20 = 460
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×30
    Solution:
    18×30 = 540
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 30×300
    Solution:
    30×300 = 9000
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×300
    Solution:
    19×300 = 5700
    Column vertical calculation:

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

[5/7 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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×300
    Solution:
    18×300 = 5400
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×6
    Solution:
    40×6 = 240
    Column vertical calculation:

						4	0
✖							6
					2	4	0
					2	4	0

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>>注：本次最多计算 7 道题。

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