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: 59-49
    Solution:
    59-49 = 10
    Column vertical calculation:

			5	9
➖			4	9
			1	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 85-63
    Solution:
    85-63 = 22
    Column vertical calculation:

			8	5
➖			6	3
			2	2

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 100-20
    Solution:
    100-20 = 80
    Column vertical calculation:

			1
			1	0	0
➖				2	0
			0	8	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 87-66
    Solution:
    87-66 = 21
    Column vertical calculation:

			8	7
➖			6	6
			2	1

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 65-60
    Solution:
    65-60 = 5
    Column vertical calculation:

			6	5
➖			6	0
			0	5

[6/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 95-45
    Solution:
    95-45 = 50
    Column vertical calculation:

			9	5
➖			4	5
			5	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 28-15
    Solution:
    28-15 = 13
    Column vertical calculation:

			2	8
➖			1	5
			1	3

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>>注：本次最多计算 7 道题。

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