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: 354*4
    Solution:
    354*4 = 1416
    Column vertical calculation:

						3	5	4
✖								4
					1	4	1	6
					1	4	1	6

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 137*2
    Solution:
    137*2 = 274
    Column vertical calculation:

						1	3	7
✖								2
						2	7	4
						2	7	4

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 754*4
    Solution:
    754*4 = 3016
    Column vertical calculation:

						7	5	4
✖								4
					3	0	1	6
					3	0	1	6

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 456*4
    Solution:
    456*4 = 1824
    Column vertical calculation:

						4	5	6
✖								4
					1	8	2	4
					1	8	2	4

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 642*2
    Solution:
    642*2 = 1284
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 532*5
    Solution:
    532*5 = 2660
    Column vertical calculation:

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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 552*4
    Solution:
    552*4 = 2208
    Column vertical calculation:

						5	5	2
✖								4
					2	2	0	8
					2	2	0	8

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>>注：本次最多计算 7 道题。

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