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: 843-146
    Solution:
    843-146 = 697
    Column vertical calculation:

			1	1
			8	4	3
➖			1	4	6
			6	9	7

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2154-942
    Solution:
    2154-942 = 1212
    Column vertical calculation:

			1
			2	1	5	4
➖				9	4	2
			1	2	1	2

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 854-536
    Solution:
    854-536 = 318
    Column vertical calculation:

				1
			8	5	4
➖			5	3	6
			3	1	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 4458-2415
    Solution:
    4458-2415 = 2043
    Column vertical calculation:

			4	4	5	8
➖			2	4	1	5
			2	0	4	3

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 2148-1453
    Solution:
    2148-1453 = 695
    Column vertical calculation:

			1	1
			2	1	4	8
➖			1	4	5	3
			0	6	9	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 4157-1235
    Solution:
    4157-1235 = 2922
    Column vertical calculation:

			1
			4	1	5	7
➖			1	2	3	5
			2	9	2	2

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1847-1278
    Solution:
    1847-1278 = 569
    Column vertical calculation:

				1	1
			1	8	4	7
➖			1	2	7	8
			0	5	6	9

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>>注：本次最多计算 7 道题。

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