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: 98-8
    Solution:
    98-8 = 90
    Column vertical calculation:

			9	8
➖				8
			9	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 42-21
    Solution:
    42-21 = 21
    Column vertical calculation:

			4	2
➖			2	1
			2	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-40
    Solution:
    65-40 = 25
    Column vertical calculation:

			6	5
➖			4	0
			2	5

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 36-13
    Solution:
    36-13 = 23
    Column vertical calculation:

			3	6
➖			1	3
			2	3

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 45-20
    Solution:
    45-20 = 25
    Column vertical calculation:

			4	5
➖			2	0
			2	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-10
    Solution:
    97-10 = 87
    Column vertical calculation:

			9	7
➖			1	0
			8	7

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-44
    Solution:
    96-44 = 52
    Column vertical calculation:

			9	6
➖			4	4
			5	2

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>>注：本次最多计算 7 道题。

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