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: 50*50
    Solution:
    50*50 = 2500
    Column vertical calculation:

							5	0
✖							5	0
							0	0
					2	5	0
					2	5	0	0

[2/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 60*60
    Solution:
    60*60 = 3600
    Column vertical calculation:

							6	0
✖							6	0
							0	0
					3	6	0
					3	6	0	0

[3/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 70*70
    Solution:
    70*70 = 4900
    Column vertical calculation:

							7	0
✖							7	0
							0	0
					4	9	0
					4	9	0	0

[4/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 80*80
    Solution:
    80*80 = 6400
    Column vertical calculation:

							8	0
✖							8	0
							0	0
					6	4	0
					6	4	0	0

[5/5 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 90*90
    Solution:
    90*90 = 8100
    Column vertical calculation:

							9	0
✖							9	0
							0	0
					8	1	0
					8	1	0	0

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