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: 29×2
    Solution:
    29×2 = 58
    Column vertical calculation:

						2	9
✖							2
						5	8
						5	8

[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: 20×5
    Solution:
    20×5 = 100
    Column vertical calculation:

						2	0
✖							5
					1	0	0
					1	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 40×5
    Solution:
    40×5 = 200
    Column vertical calculation:

						4	0
✖							5
					2	0	0
					2	0	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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