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: 23×13
    Solution:
    23×13 = 299
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×31
    Solution:
    35×31 = 1085
    Column vertical calculation:

							3	5
✖							3	1
							3	5
					1	0	5
					1	0	8	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×43
    Solution:
    35×43 = 1505
    Column vertical calculation:

							3	5
✖							4	3
						1	0	5
					1	4	0
					1	5	0	5

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 32×93
    Solution:
    32×93 = 2976
    Column vertical calculation:

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

[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: 13×13
    Solution:
    13×13 = 169
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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