Life and work have had me busy (and still do) but it’s time to reengage.
So…
Back to basic mental calculation

Mental Multiplication… I was spending quite a bit of time with difference of squares and had gotten to 3 digits when I ran out of steam. I think I am going try focusing a little more time on just getting my 0199 multiplication nailed this year. It is extremely handy and extends to much of the other mental manipulation. I will keep up the two digit difference of squares but till I really get comfortable in two digits stretching in larger numbers of calculations is not all that beneficial right now.

Soroban… My understanding is children start with about 3 years of abacus practice prior to starting flash Anzan. I have dusted off my abacus and I’ve installed BlueStacks on my PC so that I can practice using the various android apps for abacus practice out there. ( as an aside I think getting very fast with complements will help the mental calculation, I find I stumble here pretty regularily )

Major System… I have played with this a few times but not really embedded it into my thinking. My working memory is about average ( no special talents ) so the ability to manage longer strings of numbers/calculations is going to take a memory system.  This year I would like to get the basic hundred pegs fluid in my head and apply them when doing calculation to reduce my fuzziness.

Slide Rule… Occasional dabbling into estimation and logarithms… I know this is one of Kinma’s areas of interest. I will probably spend a little time this year becoming familiar
> My understanding is there are 15 kyus/levels of prescribed exams for Soroban. Can anyone point me at curriculum / testing standards. It would be nice to give myself some structure in practice.

Back to Khan Academy  I would really like to get my math up to a undergraduate university level so that I can begin to understand Physics. I really enjoy the lectures for the general public but it would make me feel better to be able to understand how the world works if not why.

On the side I have been practicing machine stenography daily for about 6 months now and while I show no special talent I am improving with each sleep. … Real Time Court Stenographers are tested to 225wpm and there are stenographers that can type into the 300wpm range. I practice 710 hours per week currently.