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: 856-626
    Solution:
    856-626 = 230
    Column vertical calculation:

			8	5	6
➖			6	2	6
			2	3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1099-455
    Solution:
    1099-455 = 644
    Column vertical calculation:

			1
			1	0	9	9
➖				4	5	5
			0	6	4	4

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 845-543
    Solution:
    845-543 = 302
    Column vertical calculation:

			8	4	5
➖			5	4	3
			3	0	2

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 957-679
    Solution:
    957-679 = 278
    Column vertical calculation:

			1	1
			9	5	7
➖			6	7	9
			2	7	8

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 931-575
    Solution:
    931-575 = 356
    Column vertical calculation:

			1	1
			9	3	1
➖			5	7	5
			3	5	6

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 987-799
    Solution:
    987-799 = 188
    Column vertical calculation:

			1	1
			9	8	7
➖			7	9	9
			1	8	8

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 457-368
    Solution:
    457-368 = 89
    Column vertical calculation:

			1	1
			4	5	7
➖			3	6	8
			0	8	9

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>>注：本次最多计算 7 道题。

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