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: 55-42
    Solution:
    55-42 = 13
    Column vertical calculation:

			5	5
➖			4	2
			1	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 70-24
    Solution:
    70-24 = 46
    Column vertical calculation:

			1
			7	0
➖			2	4
			4	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-21
    Solution:
    65-21 = 44
    Column vertical calculation:

			6	5
➖			2	1
			4	4

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 77-73
    Solution:
    77-73 = 4
    Column vertical calculation:

			7	7
➖			7	3
			0	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-94
    Solution:
    96-94 = 2
    Column vertical calculation:

			9	6
➖			9	4
			0	2

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 56-31
    Solution:
    56-31 = 25
    Column vertical calculation:

			5	6
➖			3	1
			2	5

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 46-21
    Solution:
    46-21 = 25
    Column vertical calculation:

			4	6
➖			2	1
			2	5

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>>注：本次最多计算 7 道题。

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