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: 20×2
    Solution:
    20×2 = 40
    Column vertical calculation:

						2	0
✖							2
						4	0
						4	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×4
    Solution:
    17×4 = 68
    Column vertical calculation:

						1	7
✖							4
						6	8
						6	8

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×2
    Solution:
    19×2 = 38
    Column vertical calculation:

						1	9
✖							2
						3	8
						3	8

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×2
    Solution:
    17×2 = 34
    Column vertical calculation:

						1	7
✖							2
						3	4
						3	4

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

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×40
    Solution:
    17×40 = 680
    Column vertical calculation:

							1	7
✖							4	0
							0	0
						6	8
						6	8	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×20
    Solution:
    19×20 = 380
    Column vertical calculation:

							1	9
✖							2	0
							0	0
						3	8
						3	8	0

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>>注：本次最多计算 7 道题。

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