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: 98-30
    Solution:
    98-30 = 68
    Column vertical calculation:

			9	8
➖			3	0
			6	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 94-29
    Solution:
    94-29 = 65
    Column vertical calculation:

			1
			9	4
➖			2	9
			6	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 92-20
    Solution:
    92-20 = 72
    Column vertical calculation:

			9	2
➖			2	0
			7	2

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 78-27
    Solution:
    78-27 = 51
    Column vertical calculation:

			7	8
➖			2	7
			5	1

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 49+21
    Solution:
    49+21 = 70
    Column vertical calculation:

			4	9
➕			21	1
			7	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 29-12
    Solution:
    29-12 = 17
    Column vertical calculation:

			2	9
➖			1	2
			1	7

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 50-27
    Solution:
    50-27 = 23
    Column vertical calculation:

			1
			5	0
➖			2	7
			2	3

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>>注：本次最多计算 7 道题。

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