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: 31×76
    Solution:
    31×76 = 2356
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 97×37
    Solution:
    97×37 = 3589
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 54×64
    Solution:
    54×64 = 3456
    Column vertical calculation:

							5	4
✖							6	4
						2	1	6
					3	2	4
					3	4	5	6

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 47×32
    Solution:
    47×32 = 1504
    Column vertical calculation:

							4	7
✖							3	2
							9	4
					1	4	1
					1	5	0	4

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×39
    Solution:
    25×39 = 975
    Column vertical calculation:

							2	5
✖							3	9
						2	2	5
						7	5
						9	7	5

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×83
    Solution:
    62×83 = 5146
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×47
    Solution:
    52×47 = 2444
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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