Overview: 5 questions will be solved this time.Among them
           ☆5 integer calculations

[1/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 25*25
    Solution:
    25*25 = 625
    Column vertical calculation:

							2	5
✖							2	5
						1	2	5
						5	0
						6	2	5

[2/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 35*35
    Solution:
    35*35 = 1225
    Column vertical calculation:

							3	5
✖							3	5
						1	7	5
					1	0	5
					1	2	2	5

[3/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 45*45
    Solution:
    45*45 = 2025
    Column vertical calculation:

							4	5
✖							4	5
						2	2	5
					1	8	0
					2	0	2	5

[4/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 55*55
    Solution:
    55*55 = 3025
    Column vertical calculation:

							5	5
✖							5	5
						2	7	5
					2	7	5
					3	0	2	5

[5/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 65*65
    Solution:
    65*65 = 4225
    Column vertical calculation:

							6	5
✖							6	5
						3	2	5
					3	9	0
					4	2	2	5

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