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: 72×65
    Solution:
    72×65 = 4680
    Column vertical calculation:

							7	2
✖							6	5
						3	6	0
					4	3	2
					4	6	8	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 73×49
    Solution:
    73×49 = 3577
    Column vertical calculation:

							7	3
✖							4	9
						6	5	7
					2	9	2
					3	5	7	7

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 84×76
    Solution:
    84×76 = 6384
    Column vertical calculation:

							8	4
✖							7	6
						5	0	4
					5	8	8
					6	3	8	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×39
    Solution:
    62×39 = 2418
    Column vertical calculation:

							6	2
✖							3	9
						5	5	8
					1	8	6
					2	4	1	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 87×48
    Solution:
    87×48 = 4176
    Column vertical calculation:

							8	7
✖							4	8
						6	9	6
					3	4	8
					4	1	7	6

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×85
    Solution:
    23×85 = 1955
    Column vertical calculation:

							2	3
✖							8	5
						1	1	5
					1	8	4
					1	9	5	5

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×85
    Solution:
    52×85 = 4420
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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