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: 89-30
    Solution:
    89-30 = 59
    Column vertical calculation:

			8	9
➖			3	0
			5	9

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 25-5
    Solution:
    25-5 = 20
    Column vertical calculation:

			2	5
➖				5
			2	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 76-11
    Solution:
    76-11 = 65
    Column vertical calculation:

			7	6
➖			1	1
			6	5

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-25
    Solution:
    85-25 = 60
    Column vertical calculation:

			8	5
➖			2	5
			6	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-20
    Solution:
    81-20 = 61
    Column vertical calculation:

			8	1
➖			2	0
			6	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-88
    Solution:
    99-88 = 11
    Column vertical calculation:

			9	9
➖			8	8
			1	1

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-13
    Solution:
    78-13 = 65
    Column vertical calculation:

			7	8
➖			1	3
			6	5

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>>注：本次最多计算 7 道题。

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