Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 100-20
    Solution:
    100-20 = 80
    Column vertical calculation:

			1
			1	0	0
➖				2	0
			0	8	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 100-50
    Solution:
    100-50 = 50
    Column vertical calculation:

			1
			1	0	0
➖				5	0
			0	5	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 120-40
    Solution:
    120-40 = 80
    Column vertical calculation:

			1
			1	2	0
➖				4	0
			0	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 120-20
    Solution:
    120-20 = 100
    Column vertical calculation:

			1	2	0
➖				2	0
			1	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 360-20
    Solution:
    360-20 = 340
    Column vertical calculation:

			3	6	0
➖				2	0
			3	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 360-60
    Solution:
    360-60 = 300
    Column vertical calculation:

			3	6	0
➖				6	0
			3	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 361-40
    Solution:
    361-40 = 321
    Column vertical calculation:

			3	6	1
➖				4	0
			3	2	1

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>>注：本次最多计算 7 道题。

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