Overview: 7 questions will be solved this time.Among them
           ☆7 integer calculations

[1/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 550+290
    Solution:
    550+290 = 840
    Column vertical calculation:

			5	5	0
➕			21	9	0
			8	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 720-320
    Solution:
    720-320 = 400
    Column vertical calculation:

			7	2	0
➖			3	2	0
			4	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 190-200
    Solution:
    190-200 = - (200 - 190) = - 10
    Column vertical calculation:

			1
			2	0	0
➖			1	9	0
			0	1	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-300
    Solution:
    800-300 = 500
    Column vertical calculation:

			8	0	0
➖			3	0	0
			5	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 440-100
    Solution:
    440-100 = 340
    Column vertical calculation:

			4	4	0
➖			1	0	0
			3	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 300+500
    Solution:
    300+500 = 800
    Column vertical calculation:

			3	0	0
➕			5	0	0
			8	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 800-400
    Solution:
    800-400 = 400
    Column vertical calculation:

			8	0	0
➖			4	0	0
			4	0	0

---

>>注：本次最多计算 7 道题。

Your problem has not been solved here? Please go to the Hot Problems section！