Originally Posted by KnittingMama
Originally Posted by 22B
If Topic X is a prerequisite for Topic Y, then you should cover Topic X before Topic Y.

If Topic Y is a prerequisite for Topic X, then you should cover Topic Y before Topic X.

If neither topic is a prerequisite for the other then you may do the topics in either order, or do them at the same time.

But how much proficiency should be required in Topic X before moving to Topic Y? Understanding of the topic? Being able to do the arithmetic without using fingers/calculator?

It's a bit like that classic yes/no question: how long is a piece of string?