Shawn,
Thank you for the question. The effect of the line through previous item indicator applies to the "previous item" as defined in GTM (Guidelines for Technical Material) section 12.1. One thing that qualifies as an item is "An entire number, i.e. the initiating numeric symbol and all succeeding symbols within the numeric mode thus established".
So, #aj@: would mean "10 with a line through the 1 and the 0".
*If* you have to follow print exactly and show each number within a circle, then you would need braille that means "circle enclosing 10, with a line through both number and shape". That would be ;;<$=[#aj:>@:, where the braille grouping indicators allow the effect of the line-through indicator to apply to everything they enclose.
Does that help?
–Kyle