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: 20×40
    Solution:
    20×40 = 800
    Column vertical calculation:

							2	0
✖							4	0
							0	0
						8	0
						8	0	0

[2/7 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

[3/7 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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×100
    Solution:
    14×100 = 1400
    Column vertical calculation:

								1	4
✖							1	0	0
								0	0
							0	0
						1	4
						1	4	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×400
    Solution:
    20×400 = 8000
    Column vertical calculation:

								2	0
✖							4	0	0
								0	0
							0	0
						8	0
						8	0	0	0

[6/7 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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 202×4
    Solution:
    202×4 = 808
    Column vertical calculation:

						2	0	2
✖								4
						8	0	8
						8	0	8

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>>注：本次最多计算 7 道题。

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