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: 31×2
    Solution:
    31×2 = 62
    Column vertical calculation:

						3	1
✖							2
						6	2
						6	2

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×2
    Solution:
    35×2 = 70
    Column vertical calculation:

						3	5
✖							2
						7	0
						7	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×8
    Solution:
    35×8 = 280
    Column vertical calculation:

						3	5
✖							8
					2	8	0
					2	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 62×2
    Solution:
    62×2 = 124
    Column vertical calculation:

						6	2
✖							2
					1	2	4
					1	2	4

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60×2
    Solution:
    60×2 = 120
    Column vertical calculation:

						6	0
✖							2
					1	2	0
					1	2	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×3
    Solution:
    31×3 = 93
    Column vertical calculation:

						3	1
✖							3
						9	3
						9	3

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 53×3
    Solution:
    53×3 = 159
    Column vertical calculation:

						5	3
✖							3
					1	5	9
					1	5	9

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>>注：本次最多计算 7 道题。

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