Overview: 4 questions will be solved this time.Among them
           ☆4 integer calculations

[1/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 146*5
    Solution:
    146*5 = 730
    Column vertical calculation:

						1	4	6
✖								5
						7	3	0
						7	3	0

[2/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 600*2
    Solution:
    600*2 = 1200
    Column vertical calculation:

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

[3/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 260*2
    Solution:
    260*2 = 520
    Column vertical calculation:

						2	6	0
✖								2
						5	2	0
						5	2	0

[4/4 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 360*3
    Solution:
    360*3 = 1080
    Column vertical calculation:

						3	6	0
✖								3
					1	0	8	0
					1	0	8	0

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