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

[1/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+290
    Solution:
    600+290 = 890
    Column vertical calculation:

			6	0	0
➕			2	9	0
			8	9	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 380-280
    Solution:
    380-280 = 100
    Column vertical calculation:

			3	8	0
➖			2	8	0
			1	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 260+600
    Solution:
    260+600 = 860
    Column vertical calculation:

			2	6	0
➕			6	0	0
			8	6	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+600
    Solution:
    700+600 = 1300
    Column vertical calculation:

			7	0	0
➕		1	6	0	0
		1	3	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 440-260
    Solution:
    440-260 = 180
    Column vertical calculation:

			1
			4	4	0
➖			2	6	0
			1	8	0

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 470-100
    Solution:
    470-100 = 370
    Column vertical calculation:

			4	7	0
➖			1	0	0
			3	7	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 500+700
    Solution:
    500+700 = 1200
    Column vertical calculation:

			5	0	0
➕		1	7	0	0
		1	2	0	0

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>>注：本次最多计算 7 道题。

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