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: 99-52
    Solution:
    99-52 = 47
    Column vertical calculation:

			9	9
➖			5	2
			4	7

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-76
    Solution:
    97-76 = 21
    Column vertical calculation:

			9	7
➖			7	6
			2	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-45
    Solution:
    81-45 = 36
    Column vertical calculation:

			1
			8	1
➖			4	5
			3	6

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-12
    Solution:
    68-12 = 56
    Column vertical calculation:

			6	8
➖			1	2
			5	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-22
    Solution:
    96-22 = 74
    Column vertical calculation:

			9	6
➖			2	2
			7	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 88-20
    Solution:
    88-20 = 68
    Column vertical calculation:

			8	8
➖			2	0
			6	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-30
    Solution:
    78-30 = 48
    Column vertical calculation:

			7	8
➖			3	0
			4	8

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>>注：本次最多计算 7 道题。

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