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: 45×7
    Solution:
    45×7 = 315
    Column vertical calculation:

						4	5
✖							7
					3	1	5
					3	1	5

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 61×7
    Solution:
    61×7 = 427
    Column vertical calculation:

						6	1
✖							7
					4	2	7
					4	2	7

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×7
    Solution:
    26×7 = 182
    Column vertical calculation:

						2	6
✖							7
					1	8	2
					1	8	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90×7
    Solution:
    90×7 = 630
    Column vertical calculation:

						9	0
✖							7
					6	3	0
					6	3	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 49×7
    Solution:
    49×7 = 343
    Column vertical calculation:

						4	9
✖							7
					3	4	3
					3	4	3

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 52×7
    Solution:
    52×7 = 364
    Column vertical calculation:

						5	2
✖							7
					3	6	4
					3	6	4

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>>注：本次最多计算 7 道题。

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