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: 17×19
    Solution:
    17×19 = 323
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 11×13
    Solution:
    11×13 = 143
    Column vertical calculation:

							1	1
✖							1	3
							3	3
						1	1
						1	4	3

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×14
    Solution:
    26×14 = 364
    Column vertical calculation:

							2	6
✖							1	4
						1	0	4
						2	6
						3	6	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×18
    Solution:
    24×18 = 432
    Column vertical calculation:

							2	4
✖							1	8
						1	9	2
						2	4
						4	3	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×13
    Solution:
    16×13 = 208
    Column vertical calculation:

							1	6
✖							1	3
							4	8
						1	6
						2	0	8

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×31
    Solution:
    31×31 = 961
    Column vertical calculation:

							3	1
✖							3	1
							3	1
						9	3
						9	6	1

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×12
    Solution:
    25×12 = 300
    Column vertical calculation:

							2	5
✖							1	2
							5	0
						2	5
						3	0	0

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>>注：本次最多计算 7 道题。

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