Where have I gone wrong measuring the values in a parallel circut?

Hello,
     My name is Thomas I'm a fresh student in San Diego Continuing Education Electronics Technician program and I'm going ahead on my lab work because I like to figure things out. I've completed this lab project to the best of my ability (note that it is my second day in the program) and i'd like to know where i've gone wrong. Thank you in advance for your time. PS: I am using NI Multi sim 14.0.

You have the total current flowing in the circuit from the battery, and you know the voltage, so quite simply apply Ohms law, R=V/Total current. Note that you can do it in your head, it's just 10/.3 approximately, as a quick check.As a sanity check, 1/Rt=1/R1+1/R2+1/R3 for the total resistance.
You have specified the current in Amps through to micro amps, use the one with the best resolution (most digits) remembering your power of ten. Keep in mind that in a real world measurement your test gear is going to impose a loading effect on it, and you have to take into account the calibration  accuracy,  resolution and drift of your test instrument as well. Spice  can lull you into a false sense of security.Go well, electronics is a fascinating subject, I have been involved in it now for 55 years.Cheers,Richard

Yes thank you Richard it was the total resistance formula I had wrong, I added them up as if it was a series circuit, not accounting for parallel resistance. It is very fascinating I agree, I can't wait to spend the rest of my life practicing it. We do hands-on labs in class 4 of 5 days a week and I've since witnessed the rougher edges on the instrument, it's not a perfect world.

Thomas I also have Multisim though I'm not that good with it.  Really the only thing you got wrong was the total resistance.  I did try to work out a means of getting Multisim to calculate it, and did in fact succeed by a very roundabout method (I plotted a graph of V vs V/Itot, and got a single point graph showing V/Itot = 32.43 ohms.  But far easier is to just delete the battery (or disconnect it) and hook up the virtual digital multimeter to the resistors (I have Multisim 11, it's Simulate/instruments/multimeter):
Ignore the currents, when you hook up the battery again they come right

You have the aggregate current streaming in the circuit from the battery, and you know the voltage, so basically apply Ohms law, R=V/Add up to current. Note that you can do it in your mind, it's only 10/.3 around, as a snappy check. As a once-over to verify everything is ok, 1/Rt=1/R1+1/R2+1/R3 for the aggregate obstruction. You have determined the current in Amps through to smaller scale amps, utilize the one with the best goals (most digits) recollecting your capacity of ten. Remember that in a certifiable estimation your test adapt will force a stacking impact on it, and you need to consider the alignment exactness, goals and float of your test instrument too. Zest can quiet you into an incorrect feeling that all is well with the world.