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: 54×37
    Solution:
    54×37 = 1998
    Column vertical calculation:

							5	4
✖							3	7
						3	7	8
					1	6	2
					1	9	9	8

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×57
    Solution:
    35×57 = 1995
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 43×98
    Solution:
    43×98 = 4214
    Column vertical calculation:

							4	3
✖							9	8
						3	4	4
					3	8	7
					4	2	1	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 81×72
    Solution:
    81×72 = 5832
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 57×44
    Solution:
    57×44 = 2508
    Column vertical calculation:

							5	7
✖							4	4
						2	2	8
					2	2	8
					2	5	0	8

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 43×46
    Solution:
    43×46 = 1978
    Column vertical calculation:

							4	3
✖							4	6
						2	5	8
					1	7	2
					1	9	7	8

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×23
    Solution:
    75×23 = 1725
    Column vertical calculation:

							7	5
✖							2	3
						2	2	5
					1	5	0
					1	7	2	5

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>>注：本次最多计算 7 道题。

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