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: 77-57
    Solution:
    77-57 = 20
    Column vertical calculation:

			7	7
➖			5	7
			2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-27
    Solution:
    99-27 = 72
    Column vertical calculation:

			9	9
➖			2	7
			7	2

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-14
    Solution:
    98-14 = 84
    Column vertical calculation:

			9	8
➖			1	4
			8	4

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-37
    Solution:
    99-37 = 62
    Column vertical calculation:

			9	9
➖			3	7
			6	2

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-31
    Solution:
    78-31 = 47
    Column vertical calculation:

			7	8
➖			3	1
			4	7

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 81-10
    Solution:
    81-10 = 71
    Column vertical calculation:

			8	1
➖			1	0
			7	1

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

			6	9
➖			2	4
			4	5

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>>注：本次最多计算 7 道题。

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