I’ve been analyzing the Abeka Math teacher’s manuals. For me, the manual is part of the journey to understanding. But from many, it would be overkill. What you really need to know is the math facts pacing each year so those worksheets don’t get too hard. See that little chart above? Abeka recommends that you get the previous fact family nailed before the next one is introduced. That’s Abeka 1 up there.
Here’s the one for 2GRD: