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: 342-274
    Solution:
    342-274 = 68
    Column vertical calculation:

			1	1
			3	4	2
➖			2	7	4
			0	6	8

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 758-553
    Solution:
    758-553 = 205
    Column vertical calculation:

			7	5	8
➖			5	5	3
			2	0	5

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 597-324
    Solution:
    597-324 = 273
    Column vertical calculation:

			5	9	7
➖			3	2	4
			2	7	3

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 785-247
    Solution:
    785-247 = 538
    Column vertical calculation:

				1
			7	8	5
➖			2	4	7
			5	3	8

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 978-199
    Solution:
    978-199 = 779
    Column vertical calculation:

			1	1
			9	7	8
➖			1	9	9
			7	7	9

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 1275-345
    Solution:
    1275-345 = 930
    Column vertical calculation:

			1
			1	2	7	5
➖				3	4	5
			0	9	3	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 306-118
    Solution:
    306-118 = 188
    Column vertical calculation:

			1	1
			3	0	6
➖			1	1	8
			1	8	8

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>>注：本次最多计算 7 道题。

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