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: 51×5
    Solution:
    51×5 = 255
    Column vertical calculation:

						5	1
✖							5
					2	5	5
					2	5	5

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×5
    Solution:
    42×5 = 210
    Column vertical calculation:

						4	2
✖							5
					2	1	0
					2	1	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 3×80
    Solution:
    3×80 = 240
    Column vertical calculation:

							3
✖						8	0
							0
					2	4
					2	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41×6
    Solution:
    41×6 = 246
    Column vertical calculation:

						4	1
✖							6
					2	4	6
					2	4	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41×5
    Solution:
    41×5 = 205
    Column vertical calculation:

						4	1
✖							5
					2	0	5
					2	0	5

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45×1
    Solution:
    45×1 = 45
    Column vertical calculation:

						4	5
✖							1
						4	5
						4	5

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×6
    Solution:
    42×6 = 252
    Column vertical calculation:

						4	2
✖							6
					2	5	2
					2	5	2

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>>注：本次最多计算 7 道题。

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