There is a really easy formula for this, it will work for both enlarging and shrinking the pattern. You divide the block size you have by the block size you want, or vice versa.
For instance, if your pattern is a 10" block and you want a 12" block, you would divide 12 by 10, which equals 1.2. You would enter 120% on the copier, since you want a larger block. If you have a 12" block and want it to be 10", then you reverse the numbers and divide 10 by 12, which equals .833, so you'd enter 83% or 84% on the copier.
If you're like me and can't remember which way to put the numbers, do the math on both and anything greater than 1.0 means you're enlarging, anything smaller than 1.0 means you're reducing.
Hth
