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: 87-37
    Solution:
    87-37 = 50
    Column vertical calculation:

			8	7
➖			3	7
			5	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 69-27
    Solution:
    69-27 = 42
    Column vertical calculation:

			6	9
➖			2	7
			4	2

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-54
    Solution:
    97-54 = 43
    Column vertical calculation:

			9	7
➖			5	4
			4	3

[4/7 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

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-35
    Solution:
    88-35 = 53
    Column vertical calculation:

			8	8
➖			3	5
			5	3

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 61-30
    Solution:
    61-30 = 31
    Column vertical calculation:

			6	1
➖			3	0
			3	1

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 79-24
    Solution:
    79-24 = 55
    Column vertical calculation:

			7	9
➖			2	4
			5	5

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>>注：本次最多计算 7 道题。

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