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: 77×79
    Solution:
    77×79 = 6083
    Column vertical calculation:

							7	7
✖							7	9
						6	9	3
					5	3	9
					6	0	8	3

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 79×73
    Solution:
    79×73 = 5767
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 97×87
    Solution:
    97×87 = 8439
    Column vertical calculation:

							9	7
✖							8	7
						6	7	9
					7	7	6
					8	4	3	9

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 27×78
    Solution:
    27×78 = 2106
    Column vertical calculation:

							2	7
✖							7	8
						2	1	6
					1	8	9
					2	1	0	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×73
    Solution:
    17×73 = 1241
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 87×71
    Solution:
    87×71 = 6177
    Column vertical calculation:

							8	7
✖							7	1
							8	7
					6	0	9
					6	1	7	7

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 27×77
    Solution:
    27×77 = 2079
    Column vertical calculation:

							2	7
✖							7	7
						1	8	9
					1	8	9
					2	0	7	9

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>>注：本次最多计算 7 道题。

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