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: 10×3
    Solution:
    10×3 = 30
    Column vertical calculation:

						1	0
✖							3
						3	0
						3	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 3×40
    Solution:
    3×40 = 120
    Column vertical calculation:

							3
✖						4	0
							0
					1	2
					1	2	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 7×50
    Solution:
    7×50 = 350
    Column vertical calculation:

							7
✖						5	0
							0
					3	5
					3	5	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 13×6
    Solution:
    13×6 = 78
    Column vertical calculation:

						1	3
✖							6
						7	8
						7	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 70×6
    Solution:
    70×6 = 420
    Column vertical calculation:

						7	0
✖							6
					4	2	0
					4	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 10×7
    Solution:
    10×7 = 70
    Column vertical calculation:

						1	0
✖							7
						7	0
						7	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 11×7
    Solution:
    11×7 = 77
    Column vertical calculation:

						1	1
✖							7
						7	7
						7	7

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>>注：本次最多计算 7 道题。

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