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: 89×11
    Solution:
    89×11 = 979
    Column vertical calculation:

							8	9
✖							1	1
							8	9
						8	9
						9	7	9

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×19
    Solution:
    18×19 = 342
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×29
    Solution:
    28×29 = 812
    Column vertical calculation:

							2	8
✖							2	9
						2	5	2
						5	6
						8	1	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×18
    Solution:
    18×18 = 324
    Column vertical calculation:

							1	8
✖							1	8
						1	4	4
						1	8
						3	2	4

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×29
    Solution:
    18×29 = 522
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 48×28
    Solution:
    48×28 = 1344
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 38×48
    Solution:
    38×48 = 1824
    Column vertical calculation:

							3	8
✖							4	8
						3	0	4
					1	5	2
					1	8	2	4

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>>注：本次最多计算 7 道题。

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