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: 78-28
    Solution:
    78-28 = 50
    Column vertical calculation:

			7	8
➖			2	8
			5	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-12
    Solution:
    65-12 = 53
    Column vertical calculation:

			6	5
➖			1	2
			5	3

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 33-13
    Solution:
    33-13 = 20
    Column vertical calculation:

			3	3
➖			1	3
			2	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 67-5
    Solution:
    67-5 = 62
    Column vertical calculation:

			6	7
➖				5
			6	2

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-38
    Solution:
    99-38 = 61
    Column vertical calculation:

			9	9
➖			3	8
			6	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 36-15
    Solution:
    36-15 = 21
    Column vertical calculation:

			3	6
➖			1	5
			2	1

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-27
    Solution:
    78-27 = 51
    Column vertical calculation:

			7	8
➖			2	7
			5	1

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>>注：本次最多计算 7 道题。

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