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: 51×7
    Solution:
    51×7 = 357
    Column vertical calculation:

						5	1
✖							7
					3	5	7
					3	5	7

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 3×41
    Solution:
    3×41 = 123
    Column vertical calculation:

							3
✖						4	1
							3
					1	2
					1	2	3

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 7×51
    Solution:
    7×51 = 357
    Column vertical calculation:

							7
✖						5	1
							7
					3	5
					3	5	7

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14×1
    Solution:
    14×1 = 14
    Column vertical calculation:

						1	4
✖							1
						1	4
						1	4

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 71×6
    Solution:
    71×6 = 426
    Column vertical calculation:

						7	1
✖							6
					4	2	6
					4	2	6

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16×7
    Solution:
    16×7 = 112
    Column vertical calculation:

						1	6
✖							7
					1	1	2
					1	1	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×3
    Solution:
    12×3 = 36
    Column vertical calculation:

						1	2
✖							3
						3	6
						3	6

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>>注：本次最多计算 7 道题。

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