If 10 cheese slices cost $2.48 and if 12 cheese slices cost 3.18 which one would be the best to get

Divide 2.48 by 10 to find the price of 1 slice. = 0.248
Do the same with the other price.
3.18 / 12 = 0.265

The best one to get would be the 10 cheese slices because a single slice is cheaper than the single slices for the 12 slices.

hope this helped! (:

You would rather want 10 cheese slices, because the unit rate for the 10 slices is 0.248. The unit rate for 12 slices is 0.265.