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: 33×38
    Solution:
    33×38 = 1254
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 73×63
    Solution:
    73×63 = 4599
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 93×83
    Solution:
    93×83 = 7719
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×73
    Solution:
    31×73 = 2263
    Column vertical calculation:

							3	1
✖							7	3
							9	3
					2	1	7
					2	2	6	3

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 13×63
    Solution:
    13×63 = 819
    Column vertical calculation:

							1	3
✖							6	3
							3	9
						7	8
						8	1	9

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 32×31
    Solution:
    32×31 = 992
    Column vertical calculation:

							3	2
✖							3	1
							3	2
						9	6
						9	9	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 37×73
    Solution:
    37×73 = 2701
    Column vertical calculation:

							3	7
✖							7	3
						1	1	1
					2	5	9
					2	7	0	1

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>>注：本次最多计算 7 道题。

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