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: 79-49
    Solution:
    79-49 = 30
    Column vertical calculation:

			7	9
➖			4	9
			3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 84-63
    Solution:
    84-63 = 21
    Column vertical calculation:

			8	4
➖			6	3
			2	1

[3/7 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

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 97-66
    Solution:
    97-66 = 31
    Column vertical calculation:

			9	7
➖			6	6
			3	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-60
    Solution:
    85-60 = 25
    Column vertical calculation:

			8	5
➖			6	0
			2	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 95-35
    Solution:
    95-35 = 60
    Column vertical calculation:

			9	5
➖			3	5
			6	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 28-25
    Solution:
    28-25 = 3
    Column vertical calculation:

			2	8
➖			2	5
			0	3

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>>注：本次最多计算 7 道题。

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