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see royal mail website for sizes and weights
9x6=54
448 9x6 tiles.
54
54
54
Letters up to 6' 1/8' by 11' 1/2" that weight under 1 oz are $.45 cents to mail from US city to US city. Here is the link to the information: https://www.usps.com/send/first-class.htm www.dailymischief.com
9X6=54
648 is the answer.
9x6 = 54
That's a total of 378
The commutative property