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: 32×31
    Solution:
    32×31 = 992
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 33×34
    Solution:
    33×34 = 1122
    Column vertical calculation:

							3	3
✖							3	4
						1	3	2
						9	9
					1	1	2	2

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×51
    Solution:
    42×51 = 2142
    Column vertical calculation:

							4	2
✖							5	1
							4	2
					2	1	0
					2	1	4	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×12
    Solution:
    45×12 = 540
    Column vertical calculation:

							4	5
✖							1	2
							9	0
						4	5
						5	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×13
    Solution:
    17×13 = 221
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×19
    Solution:
    12×19 = 228
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18×14
    Solution:
    18×14 = 252
    Column vertical calculation:

							1	8
✖							1	4
							7	2
						1	8
						2	5	2

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>>注：本次最多计算 7 道题。

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