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: 490-170
    Solution:
    490-170 = 320
    Column vertical calculation:

			4	9	0
➖			1	7	0
			3	2	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 780-290
    Solution:
    780-290 = 490
    Column vertical calculation:

			1
			7	8	0
➖			2	9	0
			4	9	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 340-390
    Solution:
    340-390 = - (390 - 340) = - 50
    Column vertical calculation:

			3	9	0
➖			3	4	0
			0	5	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 120+690
    Solution:
    120+690 = 810
    Column vertical calculation:

			1	2	0
➕			61	9	0
			8	1	0

[5/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 260+390
    Solution:
    260+390 = 650
    Column vertical calculation:

			2	6	0
➕			31	9	0
			6	5	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 400+690
    Solution:
    400+690 = 1090
    Column vertical calculation:

			4	0	0
➕		1	6	9	0
		1	0	9	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 900-790
    Solution:
    900-790 = 110
    Column vertical calculation:

			1
			9	0	0
➖			7	9	0
			1	1	0

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>>注：本次最多计算 7 道题。

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