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: 22×3
    Solution:
    22×3 = 66
    Column vertical calculation:

						2	2
✖							3
						6	6
						6	6

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×3
    Solution:
    20×3 = 60
    Column vertical calculation:

						2	0
✖							3
						6	0
						6	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×4
    Solution:
    22×4 = 88
    Column vertical calculation:

						2	2
✖							4
						8	8
						8	8

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 70×5
    Solution:
    70×5 = 350
    Column vertical calculation:

						7	0
✖							5
					3	5	0
					3	5	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×6
    Solution:
    22×6 = 132
    Column vertical calculation:

						2	2
✖							6
					1	3	2
					1	3	2

[6/7 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

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 2×80
    Solution:
    2×80 = 160
    Column vertical calculation:

							2
✖						8	0
							0
					1	6
					1	6	0

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>>注：本次最多计算 7 道题。

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