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: 312×3
    Solution:
    312×3 = 936
    Column vertical calculation:

						3	1	2
✖								3
						9	3	6
						9	3	6

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 211×4
    Solution:
    211×4 = 844
    Column vertical calculation:

						2	1	1
✖								4
						8	4	4
						8	4	4

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 123×5
    Solution:
    123×5 = 615
    Column vertical calculation:

						1	2	3
✖								5
						6	1	5
						6	1	5

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 348×5
    Solution:
    348×5 = 1740
    Column vertical calculation:

						3	4	8
✖								5
					1	7	4	0
					1	7	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 624×7
    Solution:
    624×7 = 4368
    Column vertical calculation:

						6	2	4
✖								7
					4	3	6	8
					4	3	6	8

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 4×108
    Solution:
    4×108 = 432
    Column vertical calculation:

								4
✖						1	0	8
							3	2
							0
						4
						4	3	2

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 670×9
    Solution:
    670×9 = 6030
    Column vertical calculation:

						6	7	0
✖								9
					6	0	3	0
					6	0	3	0

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>>注：本次最多计算 7 道题。

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