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: 78-8
    Solution:
    78-8 = 70
    Column vertical calculation:

			7	8
➖				8
			7	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-21
    Solution:
    92-21 = 71
    Column vertical calculation:

			9	2
➖			2	1
			7	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-4
    Solution:
    65-4 = 61
    Column vertical calculation:

			6	5
➖				4
			6	1

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 36-15
    Solution:
    36-15 = 21
    Column vertical calculation:

			3	6
➖			1	5
			2	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-17
    Solution:
    78-17 = 61
    Column vertical calculation:

			7	8
➖			1	7
			6	1

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 75-10
    Solution:
    75-10 = 65
    Column vertical calculation:

			7	5
➖			1	0
			6	5

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 100-40
    Solution:
    100-40 = 60
    Column vertical calculation:

			1
			1	0	0
➖				4	0
			0	6	0

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>>注：本次最多计算 7 道题。

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