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: 900-500
    Solution:
    900-500 = 400
    Column vertical calculation:

			9	0	0
➖			5	0	0
			4	0	0

[2/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 780-380
    Solution:
    780-380 = 400
    Column vertical calculation:

			7	8	0
➖			3	8	0
			4	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 840-500
    Solution:
    840-500 = 340
    Column vertical calculation:

			8	4	0
➖			5	0	0
			3	4	0

[4/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 600+390
    Solution:
    600+390 = 990
    Column vertical calculation:

			6	0	0
➕			3	9	0
			9	9	0

[5/7 Integer column vertical calculation]
    Question type: Integer subtraction
    Original question: 380-180
    Solution:
    380-180 = 200
    Column vertical calculation:

			3	8	0
➖			1	8	0
			2	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 660+340
    Solution:
    660+340 = 1000
    Column vertical calculation:

			6	6	0
➕		1	31	4	0
		1	0	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer addition
    Original question: 700+300
    Solution:
    700+300 = 1000
    Column vertical calculation:

			7	0	0
➕		1	3	0	0
		1	0	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！