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: 75-42
    Solution:
    75-42 = 33
    Column vertical calculation:

			7	5
➖			4	2
			3	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 90-24
    Solution:
    90-24 = 66
    Column vertical calculation:

			1
			9	0
➖			2	4
			6	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-21
    Solution:
    85-21 = 64
    Column vertical calculation:

			8	5
➖			2	1
			6	4

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 57-53
    Solution:
    57-53 = 4
    Column vertical calculation:

			5	7
➖			5	3
			0	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 76-74
    Solution:
    76-74 = 2
    Column vertical calculation:

			7	6
➖			7	4
			0	2

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 76-31
    Solution:
    76-31 = 45
    Column vertical calculation:

			7	6
➖			3	1
			4	5

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 66-21
    Solution:
    66-21 = 45
    Column vertical calculation:

			6	6
➖			2	1
			4	5

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>>注：本次最多计算 7 道题。

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