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: 86×39
    Solution:
    86×39 = 3354
    Column vertical calculation:

							8	6
✖							3	9
						7	7	4
					2	5	8
					3	3	5	4

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 67×39
    Solution:
    67×39 = 2613
    Column vertical calculation:

							6	7
✖							3	9
						6	0	3
					2	0	1
					2	6	1	3

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×66
    Solution:
    45×66 = 2970
    Column vertical calculation:

							4	5
✖							6	6
						2	7	0
					2	7	0
					2	9	7	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 79×78
    Solution:
    79×78 = 6162
    Column vertical calculation:

							7	9
✖							7	8
						6	3	2
					5	5	3
					6	1	6	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 54×47
    Solution:
    54×47 = 2538
    Column vertical calculation:

							5	4
✖							4	7
						3	7	8
					2	1	6
					2	5	3	8

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 83×77
    Solution:
    83×77 = 6391
    Column vertical calculation:

							8	3
✖							7	7
						5	8	1
					5	8	1
					6	3	9	1

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 87×96
    Solution:
    87×96 = 8352
    Column vertical calculation:

							8	7
✖							9	6
						5	2	2
					7	8	3
					8	3	5	2

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>>注：本次最多计算 7 道题。

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