IV calculations

0 ok......we started IV flow rates and the like last week.....and i have a hard time with math.....once i get it and do it often i am comfortable.....til then...this hit and miss with calculations kill me.....i am 45 and way out of touch.......other than math i LOVE school.....
here is a question....perhaps someone can explain it better or in a way i might grasp it......dont laugh....it is probably a very easy question
doc orders xxxxx @ a rate of 40mg/hr. the concentration of med is 600mg per liter of IV fluid. Calculate how many mg/min of the drug the PT is receiving: ALSO calculate what the drip rate is(gtts/min) if an infusion set c a drop factor of 60 gtts/ml is used......
is that c a typo......am i not getting a abreviation? otherwise this is just mumble jumble to me........sad arent i?
thanks all in advance for your help!!
paula 

Feb 11, '08 by DaytoniteQuote from momtojoshHow many mg/min of the drug is the patient receiving?Doctor orders xxxxx @ at a rate of 40mg/hr. The concentration of the medication is 600mg per liter of IV fluid. Calculate how many mg/min of the drug the patient is receiving. Also calculate what the drip rate is in gtts/min if an infusion set has a drop factor of 60 gtts/ml
40mg/hour (dose patient is receiving) x 1 hour/60 minutes (conversion factor) = 0.666 mg/minute, rounded off to 0.66mg/minuteCalculate the drip rate in gtts/minute for an infusion set with a drop factor of 60 gtts/mL
0.66mg/minute (dose desired) x 60 gtts/mL (drop factor of IV tubing) x 1 liter/600 mg (dose on hand) x 1000 mg/1 liter (conversion factor) = 66 gtts/minute (drip rate) 
Feb 12, '08 by APBT momSince Daytonite answered the calc problem, the c is supposed to have a line over it, means with.
Medical short hand written improperly another reason not to use abbreviations because when written wrong it can cause problems. 
Feb 12, '08 by momtojoshHow many mg/min of the drug is the patient receiving?
40mg/hour (dose patient is receiving) x 1 hour/60 minutes (conversion factor) = 0.666 mg/minute, rounded off to 0.66mg/minuteCalculate the drip rate in gtts/minute for an infusion set with a drop factor of 60 gtts/mL
0.66mg/minute (dose desired) x 60 gtts/mL (drop factor of IV tubing) x 1 liter/600 mg (dose on hand) x 1000 mg/1 liter (conversion factor) = 66 gtts/minute (drip rate)
still not seeing it......i divide 40 by 60 and get 0.66,what is the x 1hrdivided by 60........i plugged in all the calcs you have and got it.....but also i got it from just dividing 40/60.....
what am i not seeing......
try just pluggin in the number without all the ( )...something is confusing me......sorry.....but i DO appreciate the help!!
thanks

Feb 12, '08 by OBXRNJessokay I am confused now! I understand the first part of the problem How you got .66..but if you are just trying to find the number of drips/min don't you ignore the mg? I am setting it up like this..
60gtts/1ml X 1000ml/60min =1000gtts/min ??? Have I looked at this too long?? Since there is 1000ML in 1 liter 
Feb 13, '08 by carolinapoohQuote from DaytoniteWhen I did this according to my old calc book from first semester (because the problem bothered me, so I drug out the old book!), I got 40 gtts/min.How many mg/min of the drug is the patient receiving?
40mg/hour (dose patient is receiving) x 1 hour/60 minutes (conversion factor) = 0.666 mg/minute, rounded off to 0.66mg/minuteCalculate the drip rate in gtts/minute for an infusion set with a drop factor of 60 gtts/mL
0.66mg/minute (dose desired) x 60 gtts/mL (drop factor of IV tubing) x 1 liter/600 mg (dose on hand) x 1000 mg/1 liter (conversion factor) = 66 gtts/minute (drip rate)
According to the book, Essential Drug Dosage Calculations:
first determine the number of mLs/min to get the prescribed dose, which here is 40 mgs/hr out of 600mgs/liter. I did it the long way to check myself, and got the 0.67 (well, actually 0.666666.....).
The book now says to multiply the mLs/minute by the drip factor:
0.67(60) = 40.2 gtt/minute to give you 40 mg/hr.
All of the problems in the book are done this way, this is how we did them in school, and I never got a math problem wrong  either in didactic or in clinical. I also never killed anyone or had any med errors in clinical. So if I'm doing something wrong now, please show me  and that's a sincere request. Sometimes this stuff confuses me because I overthink it...and it is late besides!
ETA: OH YES, I AM A TOOL  I left out half the calculation  remind me not to do math this late...Last edit by carolinapooh on Feb 13, '08 : Reason: selfcorrection 
Feb 13, '08 by momtojoshthanks!!! guess alot of people in class today were confused by this one......just too wordy........in my opinion......just a med error waiting to happen if this is an order......do we really have to figeure this out in the field? I know you have to know it for the nclex.......but are thy like this??
Yup..the instructor got o.66 for the first half....and 67 for the 2nd
40(dose desired)/600(dose on hand)x1000 volume=66.66 rounded to 67.....
thanks again.... 
Aug 26, '10 by courtneylpnhello this is my 1st time on ths website and im wondering i someone can help me i moved to fl from ny and there eqipment n way o doing things are way different...theyre iv pupms are very outdated n i cannot figure how to calculate on them...i have an ive bag that says its a 100ml bag of fluid n to inuse over 30 min..thats about all the info i get!!!! so on the pump u have to enter the pri rate and the vtbi now i know the vtbi is 100ml's but how am i figuring out the pri rate if i have no drip factor or anything??? the other day i had one that said 600mg/300ml infuse over 1hr can you please help me figure out theses iv issues!!! i feel like a complete mouron!!! i basically need to know how to figure out the pri rate
thanks so much!!!