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: 12×5
    Solution:
    12×5 = 60
    Column vertical calculation:

						1	2
✖							5
						6	0
						6	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×2
    Solution:
    22×2 = 44
    Column vertical calculation:

						2	2
✖							2
						4	4
						4	4

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35×60
    Solution:
    35×60 = 2100
    Column vertical calculation:

							3	5
✖							6	0
							0	0
					2	1	0
					2	1	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17×20
    Solution:
    17×20 = 340
    Column vertical calculation:

							1	7
✖							2	0
							0	0
						3	4
						3	4	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 12×50
    Solution:
    12×50 = 600
    Column vertical calculation:

							1	2
✖							5	0
							0	0
						6	0
						6	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 22×20
    Solution:
    22×20 = 440
    Column vertical calculation:

							2	2
✖							2	0
							0	0
						4	4
						4	4	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 26×20
    Solution:
    26×20 = 520
    Column vertical calculation:

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

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>>注：本次最多计算 7 道题。

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