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: 415*6
    Solution:
    415*6 = 2490
    Column vertical calculation:

						4	1	5
✖								6
					2	4	9	0
					2	4	9	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 484*3
    Solution:
    484*3 = 1452
    Column vertical calculation:

						4	8	4
✖								3
					1	4	5	2
					1	4	5	2

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 521*3
    Solution:
    521*3 = 1563
    Column vertical calculation:

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

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 538*4
    Solution:
    538*4 = 2152
    Column vertical calculation:

						5	3	8
✖								4
					2	1	5	2
					2	1	5	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 354*5
    Solution:
    354*5 = 1770
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 317*5
    Solution:
    317*5 = 1585
    Column vertical calculation:

						3	1	7
✖								5
					1	5	8	5
					1	5	8	5

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 623*3
    Solution:
    623*3 = 1869
    Column vertical calculation:

						6	2	3
✖								3
					1	8	6	9
					1	8	6	9

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>>注：本次最多计算 7 道题。

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