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: 469-293
    Solution:
    469-293 = 176
    Column vertical calculation:

			1
			4	6	9
➖			2	9	3
			1	7	6

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 779-686
    Solution:
    779-686 = 93
    Column vertical calculation:

			1
			7	7	9
➖			6	8	6
			0	9	3

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 145-117
    Solution:
    145-117 = 28
    Column vertical calculation:

				1
			1	4	5
➖			1	1	7
			0	2	8

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 991-416
    Solution:
    991-416 = 575
    Column vertical calculation:

				1
			9	9	1
➖			4	1	6
			5	7	5

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 910-284
    Solution:
    910-284 = 626
    Column vertical calculation:

			1	1
			9	1	0
➖			2	8	4
			6	2	6

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 557-401
    Solution:
    557-401 = 156
    Column vertical calculation:

			5	5	7
➖			4	0	1
			1	5	6

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 535-481
    Solution:
    535-481 = 54
    Column vertical calculation:

			1
			5	3	5
➖			4	8	1
			0	5	4

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>>注：本次最多计算 7 道题。

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