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: 11×14
    Solution:
    11×14 = 154
    Column vertical calculation:

							1	1
✖							1	4
							4	4
						1	1
						1	5	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: 21×23
    Solution:
    21×23 = 483
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×12
    Solution:
    19×12 = 228
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×22
    Solution:
    12×22 = 264
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×26
    Solution:
    45×26 = 1170
    Column vertical calculation:

							4	5
✖							2	6
						2	7	0
						9	0
					1	1	7	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 39×42
    Solution:
    39×42 = 1638
    Column vertical calculation:

							3	9
✖							4	2
							7	8
					1	5	6
					1	6	3	8

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>>注：本次最多计算 7 道题。

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