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: 55×59
    Solution:
    55×59 = 3245
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 75×53
    Solution:
    75×53 = 3975
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 95×85
    Solution:
    95×85 = 8075
    Column vertical calculation:

							9	5
✖							8	5
						4	7	5
					7	6	0
					8	0	7	5

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 51×75
    Solution:
    51×75 = 3825
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15×63
    Solution:
    15×63 = 945
    Column vertical calculation:

							1	5
✖							6	3
							4	5
						9	0
						9	4	5

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×51
    Solution:
    52×51 = 2652
    Column vertical calculation:

							5	2
✖							5	1
							5	2
					2	6	0
					2	6	5	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 57×56
    Solution:
    57×56 = 3192
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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