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: 309×5
    Solution:
    309×5 = 1545
    Column vertical calculation:

						3	0	9
✖								5
					1	5	4	5
					1	5	4	5

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 604×8
    Solution:
    604×8 = 4832
    Column vertical calculation:

						6	0	4
✖								8
					4	8	3	2
					4	8	3	2

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 280×3
    Solution:
    280×3 = 840
    Column vertical calculation:

						2	8	0
✖								3
						8	4	0
						8	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 430×7
    Solution:
    430×7 = 3010
    Column vertical calculation:

						4	3	0
✖								7
					3	0	1	0
					3	0	1	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 640×2
    Solution:
    640×2 = 1280
    Column vertical calculation:

						6	4	0
✖								2
					1	2	8	0
					1	2	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 450×6
    Solution:
    450×6 = 2700
    Column vertical calculation:

						4	5	0
✖								6
					2	7	0	0
					2	7	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 230×4
    Solution:
    230×4 = 920
    Column vertical calculation:

						2	3	0
✖								4
						9	2	0
						9	2	0

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>>注：本次最多计算 7 道题。

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