Q: Can we use a 1 and a 0 to substitute for 10 for the Goal?

A: Yes, if you’re not using math to meet a Goal, a 1 and a 0 can always be substituted for a 10.

If you’re using Math Rules, however, Combine Digits (Math Fluxx 2.0) or Grafting (Math Fluxx 1.0) would have to be in play to make your 1 and 0 count as a 10.