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: 45-3
    Solution:
    45-3 = 42
    Column vertical calculation:

			4	5
➖				3
			4	2

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 69-45
    Solution:
    69-45 = 24
    Column vertical calculation:

			6	9
➖			4	5
			2	4

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 35-11
    Solution:
    35-11 = 24
    Column vertical calculation:

			3	5
➖			1	1
			2	4

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-65
    Solution:
    85-65 = 20
    Column vertical calculation:

			8	5
➖			6	5
			2	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 91-60
    Solution:
    91-60 = 31
    Column vertical calculation:

			9	1
➖			6	0
			3	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-3
    Solution:
    99-3 = 96
    Column vertical calculation:

			9	9
➖				3
			9	6

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-36
    Solution:
    78-36 = 42
    Column vertical calculation:

			7	8
➖			3	6
			4	2

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>>注：本次最多计算 7 道题。

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