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: 14×18
    Solution:
    14×18 = 252
    Column vertical calculation:

							1	4
✖							1	8
						1	1	2
						1	4
						2	5	2

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×31
    Solution:
    28×31 = 868
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×11
    Solution:
    42×11 = 462
    Column vertical calculation:

							4	2
✖							1	1
							4	2
						4	2
						4	6	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×17
    Solution:
    18×17 = 306
    Column vertical calculation:

							1	8
✖							1	7
						1	2	6
						1	8
						3	0	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×22
    Solution:
    28×22 = 616
    Column vertical calculation:

							2	8
✖							2	2
							5	6
						5	6
						6	1	6

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×27
    Solution:
    17×27 = 459
    Column vertical calculation:

							1	7
✖							2	7
						1	1	9
						3	4
						4	5	9

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 37×11
    Solution:
    37×11 = 407
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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