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: 1247-217
    Solution:
    1247-217 = 1030
    Column vertical calculation:

			1	2	4	7
➖				2	1	7
			1	0	3	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 641-312
    Solution:
    641-312 = 329
    Column vertical calculation:

				1
			6	4	1
➖			3	1	2
			3	2	9

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1245-115
    Solution:
    1245-115 = 1130
    Column vertical calculation:

			1	2	4	5
➖				1	1	5
			1	1	3	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 716-417
    Solution:
    716-417 = 299
    Column vertical calculation:

			1	1
			7	1	6
➖			4	1	7
			2	9	9

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 523-254
    Solution:
    523-254 = 269
    Column vertical calculation:

			1	1
			5	2	3
➖			2	5	4
			2	6	9

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 169-164
    Solution:
    169-164 = 5
    Column vertical calculation:

			1	6	9
➖			1	6	4
			0	0	5

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 842-132
    Solution:
    842-132 = 710
    Column vertical calculation:

			8	4	2
➖			1	3	2
			7	1	0

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>>注：本次最多计算 7 道题。

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