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: 75-61
    Solution:
    75-61 = 14
    Column vertical calculation:

			7	5
➖			6	1
			1	4

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 57-5
    Solution:
    57-5 = 52
    Column vertical calculation:

			5	7
➖				5
			5	2

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 79-18
    Solution:
    79-18 = 61
    Column vertical calculation:

			7	9
➖			1	8
			6	1

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 72-51
    Solution:
    72-51 = 21
    Column vertical calculation:

			7	2
➖			5	1
			2	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 98-17
    Solution:
    98-17 = 81
    Column vertical calculation:

			9	8
➖			1	7
			8	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 100-30
    Solution:
    100-30 = 70
    Column vertical calculation:

			1
			1	0	0
➖				3	0
			0	7	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-78
    Solution:
    99-78 = 21
    Column vertical calculation:

			9	9
➖			7	8
			2	1

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>>注：本次最多计算 7 道题。

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