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           ☆1 integer calculations

[1/1 Integer column vertical calculation]
    Question type: Integer multiplication
    Original question: 64*512
    Solution:
    64*512 = 32768
    Column vertical calculation:

								6	4
✖							5	1	2
							1	2	8
							6	4
					3	2	0
					3	2	7	6	8

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