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: 4×963
    Solution:
    4×963 = 3852
    Column vertical calculation:

								4
✖						9	6	3
							1	2
						2	4
					3	6
					3	8	5	2

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 898×3
    Solution:
    898×3 = 2694
    Column vertical calculation:

						8	9	8
✖								3
					2	6	9	4
					2	6	9	4

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 390×2
    Solution:
    390×2 = 780
    Column vertical calculation:

						3	9	0
✖								2
						7	8	0
						7	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 450×8
    Solution:
    450×8 = 3600
    Column vertical calculation:

						4	5	0
✖								8
					3	6	0	0
					3	6	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 627×9
    Solution:
    627×9 = 5643
    Column vertical calculation:

						6	2	7
✖								9
					5	6	4	3
					5	6	4	3

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 420×4
    Solution:
    420×4 = 1680
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 230×9
    Solution:
    230×9 = 2070
    Column vertical calculation:

						2	3	0
✖								9
					2	0	7	0
					2	0	7	0

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>>注：本次最多计算 7 道题。

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