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: 21×12
    Solution:
    21×12 = 252
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41×21
    Solution:
    41×21 = 861
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 34×49
    Solution:
    34×49 = 1666
    Column vertical calculation:

							3	4
✖							4	9
						3	0	6
					1	3	6
					1	6	6	6

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×14
    Solution:
    42×14 = 588
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×41
    Solution:
    31×41 = 1271
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×19
    Solution:
    23×19 = 437
    Column vertical calculation:

							2	3
✖							1	9
						2	0	7
						2	3
						4	3	7

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×17
    Solution:
    16×17 = 272
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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