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: 568-309
    Solution:
    568-309 = 259
    Column vertical calculation:

				1
			5	6	8
➖			3	0	9
			2	5	9

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 959-583
    Solution:
    959-583 = 376
    Column vertical calculation:

			1
			9	5	9
➖			5	8	3
			3	7	6

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 494-264
    Solution:
    494-264 = 230
    Column vertical calculation:

			4	9	4
➖			2	6	4
			2	3	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 867-387
    Solution:
    867-387 = 480
    Column vertical calculation:

			1
			8	6	7
➖			3	8	7
			4	8	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 711-217
    Solution:
    711-217 = 494
    Column vertical calculation:

			1	1
			7	1	1
➖			2	1	7
			4	9	4

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 803-408
    Solution:
    803-408 = 395
    Column vertical calculation:

			1	1
			8	0	3
➖			4	0	8
			3	9	5

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 771-419
    Solution:
    771-419 = 352
    Column vertical calculation:

				1
			7	7	1
➖			4	1	9
			3	5	2

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>>注：本次最多计算 7 道题。

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