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: 17×21
    Solution:
    17×21 = 357
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 32×12
    Solution:
    32×12 = 384
    Column vertical calculation:

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

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 13×62
    Solution:
    13×62 = 806
    Column vertical calculation:

							1	3
✖							6	2
							2	6
						7	8
						8	0	6

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 32×13
    Solution:
    32×13 = 416
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 24×12
    Solution:
    24×12 = 288
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 51×21
    Solution:
    51×21 = 1071
    Column vertical calculation:

							5	1
✖							2	1
							5	1
					1	0	2
					1	0	7	1

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×11
    Solution:
    42×11 = 462
    Column vertical calculation:

							4	2
✖							1	1
							4	2
						4	2
						4	6	2

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>>注：本次最多计算 7 道题。

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