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: 15×7
    Solution:
    15×7 = 105
    Column vertical calculation:

						1	5
✖							7
					1	0	5
					1	0	5

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 55×7
    Solution:
    55×7 = 385
    Column vertical calculation:

						5	5
✖							7
					3	8	5
					3	8	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×7
    Solution:
    22×7 = 154
    Column vertical calculation:

						2	2
✖							7
					1	5	4
					1	5	4

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×7
    Solution:
    29×7 = 203
    Column vertical calculation:

						2	9
✖							7
					2	0	3
					2	0	3

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×7
    Solution:
    40×7 = 280
    Column vertical calculation:

						4	0
✖							7
					2	8	0
					2	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 42×7
    Solution:
    42×7 = 294
    Column vertical calculation:

						4	2
✖							7
					2	9	4
					2	9	4

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×7
    Solution:
    50×7 = 350
    Column vertical calculation:

						5	0
✖							7
					3	5	0
					3	5	0

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>>注：本次最多计算 7 道题。

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