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: 15×14
    Solution:
    15×14 = 210
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×15
    Solution:
    16×15 = 240
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×23
    Solution:
    26×23 = 598
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×12
    Solution:
    17×12 = 204
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×22
    Solution:
    18×22 = 396
    Column vertical calculation:

							1	8
✖							2	2
							3	6
						3	6
						3	9	6

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 46×26
    Solution:
    46×26 = 1196
    Column vertical calculation:

							4	6
✖							2	6
						2	7	6
						9	2
					1	1	9	6

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×42
    Solution:
    31×42 = 1302
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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