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: 70-10
    Solution:
    70-10 = 60
    Column vertical calculation:

			7	0
➖			1	0
			6	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 93-78
    Solution:
    93-78 = 15
    Column vertical calculation:

			1
			9	3
➖			7	8
			1	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 63-19
    Solution:
    63-19 = 44
    Column vertical calculation:

			1
			6	3
➖			1	9
			4	4

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 68-14
    Solution:
    68-14 = 54
    Column vertical calculation:

			6	8
➖			1	4
			5	4

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 75-35
    Solution:
    75-35 = 40
    Column vertical calculation:

			7	5
➖			3	5
			4	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-66
    Solution:
    96-66 = 30
    Column vertical calculation:

			9	6
➖			6	6
			3	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-23
    Solution:
    78-23 = 55
    Column vertical calculation:

			7	8
➖			2	3
			5	5

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>>注：本次最多计算 7 道题。

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