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: 17×2
    Solution:
    17×2 = 34
    Column vertical calculation:

						1	7
✖							2
						3	4
						3	4

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×4
    Solution:
    14×4 = 56
    Column vertical calculation:

						1	4
✖							4
						5	6
						5	6

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×2
    Solution:
    16×2 = 32
    Column vertical calculation:

						1	6
✖							2
						3	2
						3	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×2
    Solution:
    14×2 = 28
    Column vertical calculation:

						1	4
✖							2
						2	8
						2	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×20
    Solution:
    17×20 = 340
    Column vertical calculation:

							1	7
✖							2	0
							0	0
						3	4
						3	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×40
    Solution:
    14×40 = 560
    Column vertical calculation:

							1	4
✖							4	0
							0	0
						5	6
						5	6	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×20
    Solution:
    16×20 = 320
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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