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: 55-40
    Solution:
    55-40 = 15
    Column vertical calculation:

			5	5
➖			4	0
			1	5

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 70-22
    Solution:
    70-22 = 48
    Column vertical calculation:

			1
			7	0
➖			2	2
			4	8

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-19
    Solution:
    65-19 = 46
    Column vertical calculation:

			1
			6	5
➖			1	9
			4	6

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 77-71
    Solution:
    77-71 = 6
    Column vertical calculation:

			7	7
➖			7	1
			0	6

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 96-92
    Solution:
    96-92 = 4
    Column vertical calculation:

			9	6
➖			9	2
			0	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 56-29
    Solution:
    56-29 = 27
    Column vertical calculation:

			1
			5	6
➖			2	9
			2	7

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 46-19
    Solution:
    46-19 = 27
    Column vertical calculation:

			1
			4	6
➖			1	9
			2	7

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>>注：本次最多计算 7 道题。

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