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: 19×19
    Solution:
    19×19 = 361
    Column vertical calculation:

							1	9
✖							1	9
						1	7	1
						1	9
						3	6	1

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×13
    Solution:
    19×13 = 247
    Column vertical calculation:

							1	9
✖							1	3
							5	7
						1	9
						2	4	7

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×14
    Solution:
    29×14 = 406
    Column vertical calculation:

							2	9
✖							1	4
						1	1	6
						2	9
						4	0	6

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 29×18
    Solution:
    29×18 = 522
    Column vertical calculation:

							2	9
✖							1	8
						2	3	2
						2	9
						5	2	2

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 19×13
    Solution:
    19×13 = 247
    Column vertical calculation:

							1	9
✖							1	3
							5	7
						1	9
						2	4	7

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 91×31
    Solution:
    91×31 = 2821
    Column vertical calculation:

							9	1
✖							3	1
							9	1
					2	7	3
					2	8	2	1

[7/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25×92
    Solution:
    25×92 = 2300
    Column vertical calculation:

							2	5
✖							9	2
							5	0
					2	2	5
					2	3	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！