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: 20×4
    Solution:
    20×4 = 80
    Column vertical calculation:

						2	0
✖							4
						8	0
						8	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×5
    Solution:
    22×5 = 110
    Column vertical calculation:

						2	2
✖							5
					1	1	0
					1	1	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×7
    Solution:
    20×7 = 140
    Column vertical calculation:

						2	0
✖							7
					1	4	0
					1	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×8
    Solution:
    21×8 = 168
    Column vertical calculation:

						2	1
✖							8
					1	6	8
					1	6	8

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 8×60
    Solution:
    8×60 = 480
    Column vertical calculation:

							8
✖						6	0
							0
					4	8
					4	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×6
    Solution:
    20×6 = 120
    Column vertical calculation:

						2	0
✖							6
					1	2	0
					1	2	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 8×70
    Solution:
    8×70 = 560
    Column vertical calculation:

							8
✖						7	0
							0
					5	6
					5	6	0

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>>注：本次最多计算 7 道题。

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