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: 70-15
    Solution:
    70-15 = 55
    Column vertical calculation:

			1
			7	0
➖			1	5
			5	5

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 102-35
    Solution:
    102-35 = 67
    Column vertical calculation:

			1	1
			1	0	2
➖				3	5
			0	6	7

[3/7 Formula]
    Work: Calculate the value of equation 6.9+5 .
    Question type: Mathematical calculation
    Solution:
          6.9+5
        =11.9
    Answer:6.9+5=11.9
[4/7 Formula]
    Work: Calculate the value of equation 10.8+2 .
    Question type: Mathematical calculation
    Solution:
          10.8+2
        =12.8
    Answer:10.8+2=12.8
[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 99-5
    Solution:
    99-5 = 94
    Column vertical calculation:

			9	9
➖				5
			9	4

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 38+25
    Solution:
    38+25 = 63
    Column vertical calculation:

			3	8
➕			21	5
			6	3

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 45+33
    Solution:
    45+33 = 78
    Column vertical calculation:

			4	5
➕			3	3
			7	8

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>>注：本次最多计算 7 道题。

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