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: 421×5
    Solution:
    421×5 = 2105
    Column vertical calculation:

						4	2	1
✖								5
					2	1	0	5
					2	1	0	5

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 622×5
    Solution:
    622×5 = 3110
    Column vertical calculation:

						6	2	2
✖								5
					3	1	1	0
					3	1	1	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 985×4
    Solution:
    985×4 = 3940
    Column vertical calculation:

						9	8	5
✖								4
					3	9	4	0
					3	9	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 634×6
    Solution:
    634×6 = 3804
    Column vertical calculation:

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

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 621×6
    Solution:
    621×6 = 3726
    Column vertical calculation:

						6	2	1
✖								6
					3	7	2	6
					3	7	2	6

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 473×6
    Solution:
    473×6 = 2838
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 762×4
    Solution:
    762×4 = 3048
    Column vertical calculation:

						7	6	2
✖								4
					3	0	4	8
					3	0	4	8

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>>注：本次最多计算 7 道题。

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