Overview: 7 questions will be solved this time.Among them
           ☆2 arithmetic calculations
           ☆5 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 70-12
    Solution:
    70-12 = 58
    Column vertical calculation:

			1
			7	0
➖			1	2
			5	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 102-55
    Solution:
    102-55 = 47
    Column vertical calculation:

			1	1
			1	0	2
➖				5	5
			0	4	7

[3/7 Formula]
    Work: Calculate the value of equation 6.9+9 .
    Question type: Mathematical calculation
    Solution:
          6.9+9
        =15.9
    Answer:6.9+9=15.9
[4/7 Formula]
    Work: Calculate the value of equation 10.8+5 .
    Question type: Mathematical calculation
    Solution:
          10.8+5
        =15.8
    Answer:10.8+5=15.8
[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-35
    Solution:
    99-35 = 64
    Column vertical calculation:

			9	9
➖			3	5
			6	4

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 47+25
    Solution:
    47+25 = 72
    Column vertical calculation:

			4	7
➕			21	5
			7	2

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 42+33
    Solution:
    42+33 = 75
    Column vertical calculation:

			4	2
➕			3	3
			7	5

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>>注：本次最多计算 7 道题。

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