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: 99×14
    Solution:
    99×14 = 1386
    Column vertical calculation:

							9	9
✖							1	4
						3	9	6
						9	9
					1	3	8	6

[2/7 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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×29
    Solution:
    21×29 = 609
    Column vertical calculation:

							2	1
✖							2	9
						1	8	9
						4	2
						6	0	9

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×19
    Solution:
    19×19 = 361
    Column vertical calculation:

							1	9
✖							1	9
						1	7	1
						1	9
						3	6	1

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×29
    Solution:
    12×29 = 348
    Column vertical calculation:

							1	2
✖							2	9
						1	0	8
						2	4
						3	4	8

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×29
    Solution:
    45×29 = 1305
    Column vertical calculation:

							4	5
✖							2	9
						4	0	5
						9	0
					1	3	0	5

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 39×49
    Solution:
    39×49 = 1911
    Column vertical calculation:

							3	9
✖							4	9
						3	5	1
					1	5	6
					1	9	1	1

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>>注：本次最多计算 7 道题。

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