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

[1/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×20
    Solution:
    23×20 = 460
    Column vertical calculation:

							2	3
✖							2	0
							0	0
						4	6
						4	6	0

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×40
    Solution:
    20×40 = 800
    Column vertical calculation:

							2	0
✖							4	0
							0	0
						8	0
						8	0	0

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 31×200
    Solution:
    31×200 = 6200
    Column vertical calculation:

								3	1
✖							2	0	0
								0	0
							0	0
						6	2
						6	2	0	0

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 21×200
    Solution:
    21×200 = 4200
    Column vertical calculation:

								2	1
✖							2	0	0
								0	0
							0	0
						4	2
						4	2	0	0

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 23×200
    Solution:
    23×200 = 4600
    Column vertical calculation:

								2	3
✖							2	0	0
								0	0
							0	0
						4	6
						4	6	0	0

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×400
    Solution:
    20×400 = 8000
    Column vertical calculation:

								2	0
✖							4	0	0
								0	0
							0	0
						8	0
						8	0	0	0

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×5
    Solution:
    19×5 = 95
    Column vertical calculation:

						1	9
✖							5
						9	5
						9	5

---

>>注：本次最多计算 7 道题。

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