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: 13*13
    Solution:
    13*13 = 169
    Column vertical calculation:

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

[2/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 14*14
    Solution:
    14*14 = 196
    Column vertical calculation:

							1	4
✖							1	4
							5	6
						1	4
						1	9	6

[3/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 15*15
    Solution:
    15*15 = 225
    Column vertical calculation:

							1	5
✖							1	5
							7	5
						1	5
						2	2	5

[4/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 16*16
    Solution:
    16*16 = 256
    Column vertical calculation:

							1	6
✖							1	6
							9	6
						1	6
						2	5	6

[5/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 17*17
    Solution:
    17*17 = 289
    Column vertical calculation:

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

[6/7 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 18*18
    Solution:
    18*18 = 324
    Column vertical calculation:

							1	8
✖							1	8
						1	4	4
						1	8
						3	2	4

[7/7 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

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>>注：本次最多计算 7 道题。

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