Overview: 6 questions will be solved this time.Among them
           ☆6 integer calculations

[1/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 41*41
    Solution:
    41*41 = 1681
    Column vertical calculation:

							4	1
✖							4	1
							4	1
					1	6	4
					1	6	8	1

[2/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 51*51
    Solution:
    51*51 = 2601
    Column vertical calculation:

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

[3/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 61*61
    Solution:
    61*61 = 3721
    Column vertical calculation:

							6	1
✖							6	1
							6	1
					3	6	6
					3	7	2	1

[4/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 71*71
    Solution:
    71*71 = 5041
    Column vertical calculation:

							7	1
✖							7	1
							7	1
					4	9	7
					5	0	4	1

[5/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 81*81
    Solution:
    81*81 = 6561
    Column vertical calculation:

							8	1
✖							8	1
							8	1
					6	4	8
					6	5	6	1

[6/6 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 91*91
    Solution:
    91*91 = 8281
    Column vertical calculation:

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

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