Inch Block

What size squares would you make for a twin-sized rag quilt?++?

I am no good with math..I made a rag quilt a couple summers ago using nine inch blocks but with seam allowances and i don't know somehow it was too small. I want to make another one this summer and make sure to get the size right. The quilt should be 90" by 60" I think. So if each row has five squares (it is a checkered pattern), what should the size of each square be? Thanks in advance. Any help and tips are appreciated :)

Here is some math for which you asked.
Example squares for a twin-sized quilt could be 12" x 12", or perhaps 6" x 6".
If each square is 12" x 12":
  •   then (for 60") you would get exactly 5 squares for each row (60 ÷ 12 = 5);
  •   and (for 90") you would get 7½ squares for each column (90 ÷ 12 = 7.5).
If each square is 6" x 6":
  •   then (for 60") you would get exactly 10 squares for each row (60 ÷ 6 = 10);
  •   and (for 90") you would get exactly 15 squares for each column (90 ÷ 6 = 15).

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