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: 93-30
    Solution:
    93-30 = 63
    Column vertical calculation:

			9	3
➖			3	0
			6	3

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 89-29
    Solution:
    89-29 = 60
    Column vertical calculation:

			8	9
➖			2	9
			6	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-20
    Solution:
    87-20 = 67
    Column vertical calculation:

			8	7
➖			2	0
			6	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 73-27
    Solution:
    73-27 = 46
    Column vertical calculation:

			1
			7	3
➖			2	7
			4	6

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 44+21
    Solution:
    44+21 = 65
    Column vertical calculation:

			4	4
➕			2	1
			6	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 24-12
    Solution:
    24-12 = 12
    Column vertical calculation:

			2	4
➖			1	2
			1	2

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 45-27
    Solution:
    45-27 = 18
    Column vertical calculation:

			1
			4	5
➖			2	7
			1	8

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>>注：本次最多计算 7 道题。

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