Overview: 3 questions will be solved this time.Among them
           ☆3 integer calculations

[1/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 20×6
    Solution:
    20×6 = 120
    Column vertical calculation:

						2	0
✖							6
					1	2	0
					1	2	0

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 8×80
    Solution:
    8×80 = 640
    Column vertical calculation:

							8
✖						8	0
							0
					6	4
					6	4	0

[3/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 28×5
    Solution:
    28×5 = 140
    Column vertical calculation:

						2	8
✖							5
					1	4	0
					1	4	0

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