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: 19×99
    Solution:
    19×99 = 1881
    Column vertical calculation:

							1	9
✖							9	9
						1	7	1
					1	7	1
					1	8	8	1

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×93
    Solution:
    19×93 = 1767
    Column vertical calculation:

							1	9
✖							9	3
							5	7
					1	7	1
					1	7	6	7

[3/7 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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×98
    Solution:
    29×98 = 2842
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×83
    Solution:
    19×83 = 1577
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 91×81
    Solution:
    91×81 = 7371
    Column vertical calculation:

							9	1
✖							8	1
							9	1
					7	2	8
					7	3	7	1

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×98
    Solution:
    25×98 = 2450
    Column vertical calculation:

							2	5
✖							9	8
						2	0	0
					2	2	5
					2	4	5	0

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>>注：本次最多计算 7 道题。

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