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: 20-19
    Solution:
    20-19 = 1
    Column vertical calculation:

			1
			2	0
➖			1	9
			0	1

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 70-36
    Solution:
    70-36 = 34
    Column vertical calculation:

			1
			7	0
➖			3	6
			3	4

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 75-58
    Solution:
    75-58 = 17
    Column vertical calculation:

			1
			7	5
➖			5	8
			1	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-29
    Solution:
    68-29 = 39
    Column vertical calculation:

			1
			6	8
➖			2	9
			3	9

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 70-69
    Solution:
    70-69 = 1
    Column vertical calculation:

			1
			7	0
➖			6	9
			0	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 72-43
    Solution:
    72-43 = 29
    Column vertical calculation:

			1
			7	2
➖			4	3
			2	9

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 62-41
    Solution:
    62-41 = 21
    Column vertical calculation:

			6	2
➖			4	1
			2	1

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>>注：本次最多计算 7 道题。

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