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: 72-47
    Solution:
    72-47 = 25
    Column vertical calculation:

			1
			7	2
➖			4	7
			2	5

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 94-38
    Solution:
    94-38 = 56
    Column vertical calculation:

			1
			9	4
➖			3	8
			5	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 66-51
    Solution:
    66-51 = 15
    Column vertical calculation:

			6	6
➖			5	1
			1	5

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 22-11
    Solution:
    22-11 = 11
    Column vertical calculation:

			2	2
➖			1	1
			1	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-87
    Solution:
    99-87 = 12
    Column vertical calculation:

			9	9
➖			8	7
			1	2

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 79-26
    Solution:
    79-26 = 53
    Column vertical calculation:

			7	9
➖			2	6
			5	3

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 57-13
    Solution:
    57-13 = 44
    Column vertical calculation:

			5	7
➖			1	3
			4	4

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>>注：本次最多计算 7 道题。

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