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: 28×2
    Solution:
    28×2 = 56
    Column vertical calculation:

						2	8
✖							2
						5	6
						5	6

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×6
    Solution:
    50×6 = 300
    Column vertical calculation:

						5	0
✖							6
					3	0	0
					3	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41×2
    Solution:
    41×2 = 82
    Column vertical calculation:

						4	1
✖							2
						8	2
						8	2

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41×3
    Solution:
    41×3 = 123
    Column vertical calculation:

						4	1
✖							3
					1	2	3
					1	2	3

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×20
    Solution:
    28×20 = 560
    Column vertical calculation:

							2	8
✖							2	0
							0	0
						5	6
						5	6	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 50×60
    Solution:
    50×60 = 3000
    Column vertical calculation:

							5	0
✖							6	0
							0	0
					3	0	0
					3	0	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41×20
    Solution:
    41×20 = 820
    Column vertical calculation:

							4	1
✖							2	0
							0	0
						8	2
						8	2	0

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>>注：本次最多计算 7 道题。

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