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: 4521-124
    Solution:
    4521-124 = 4397
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 574-123
    Solution:
    574-123 = 451
    Column vertical calculation:

			5	7	4
➖			1	2	3
			4	5	1

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 465-308
    Solution:
    465-308 = 157
    Column vertical calculation:

				1
			4	6	5
➖			3	0	8
			1	5	7

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 208-166
    Solution:
    208-166 = 42
    Column vertical calculation:

			1
			2	0	8
➖			1	6	6
			0	4	2

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 514-202
    Solution:
    514-202 = 312
    Column vertical calculation:

			5	1	4
➖			2	0	2
			3	1	2

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 387-314
    Solution:
    387-314 = 73
    Column vertical calculation:

			3	8	7
➖			3	1	4
			0	7	3

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1124-847
    Solution:
    1124-847 = 277
    Column vertical calculation:

			1	1	1
			1	1	2	4
➖				8	4	7
			0	2	7	7

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>>注：本次最多计算 7 道题。

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