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: 350+390
    Solution:
    350+390 = 740
    Column vertical calculation:

			3	5	0
➕			31	9	0
			7	4	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 520-420
    Solution:
    520-420 = 100
    Column vertical calculation:

			5	2	0
➖			4	2	0
			1	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 390-100
    Solution:
    390-100 = 290
    Column vertical calculation:

			3	9	0
➖			1	0	0
			2	9	0

[4/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 600-400
    Solution:
    600-400 = 200
    Column vertical calculation:

			6	0	0
➖			4	0	0
			2	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 640-200
    Solution:
    640-200 = 440
    Column vertical calculation:

			6	4	0
➖			2	0	0
			4	4	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 100+600
    Solution:
    100+600 = 700
    Column vertical calculation:

			1	0	0
➕			6	0	0
			7	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 600-500
    Solution:
    600-500 = 100
    Column vertical calculation:

			6	0	0
➖			5	0	0
			1	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！