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: 79×78
    Solution:
    79×78 = 6162
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 88×57
    Solution:
    88×57 = 5016
    Column vertical calculation:

							8	8
✖							5	7
						6	1	6
					4	4	0
					5	0	1	6

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 84×67
    Solution:
    84×67 = 5628
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×73
    Solution:
    52×73 = 3796
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 98×27
    Solution:
    98×27 = 2646
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×59
    Solution:
    28×59 = 1652
    Column vertical calculation:

							2	8
✖							5	9
						2	5	2
					1	4	0
					1	6	5	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 84×64
    Solution:
    84×64 = 5376
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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