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: 95-30
    Solution:
    95-30 = 65
    Column vertical calculation:

			9	5
➖			3	0
			6	5

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 69-5
    Solution:
    69-5 = 64
    Column vertical calculation:

			6	9
➖				5
			6	4

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-11
    Solution:
    65-11 = 54
    Column vertical calculation:

			6	5
➖			1	1
			5	4

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-45
    Solution:
    85-45 = 40
    Column vertical calculation:

			8	5
➖			4	5
			4	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-70
    Solution:
    81-70 = 11
    Column vertical calculation:

			8	1
➖			7	0
			1	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-39
    Solution:
    99-39 = 60
    Column vertical calculation:

			9	9
➖			3	9
			6	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-35
    Solution:
    78-35 = 43
    Column vertical calculation:

			7	8
➖			3	5
			4	3

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>>注：本次最多计算 7 道题。

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