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: 21×34
    Solution:
    21×34 = 714
    Column vertical calculation:

							2	1
✖							3	4
							8	4
						6	3
						7	1	4

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×15
    Solution:
    17×15 = 255
    Column vertical calculation:

							1	7
✖							1	5
							8	5
						1	7
						2	5	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×13
    Solution:
    31×13 = 403
    Column vertical calculation:

							3	1
✖							1	3
							9	3
						3	1
						4	0	3

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 27×14
    Solution:
    27×14 = 378
    Column vertical calculation:

							2	7
✖							1	4
						1	0	8
						2	7
						3	7	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×15
    Solution:
    18×15 = 270
    Column vertical calculation:

							1	8
✖							1	5
							9	0
						1	8
						2	7	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 13×21
    Solution:
    13×21 = 273
    Column vertical calculation:

							1	3
✖							2	1
							1	3
						2	6
						2	7	3

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×54
    Solution:
    12×54 = 648
    Column vertical calculation:

							1	2
✖							5	4
							4	8
						6	0
						6	4	8

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>>注：本次最多计算 7 道题。

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