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: 61×7
    Solution:
    61×7 = 427
    Column vertical calculation:

						6	1
✖							7
					4	2	7
					4	2	7

[2/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 61×8
    Solution:
    61×8 = 488
    Column vertical calculation:

						6	1
✖							8
					4	8	8
					4	8	8

[3/3 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 61×4
    Solution:
    61×4 = 244
    Column vertical calculation:

						6	1
✖							4
					2	4	4
					2	4	4

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