want to know backward and front method of med math

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hi guys,

I came accross this in one of the posted thread. The poster said he used it to answer maths questions in nlex, can any one tell me how to apply this method in maths?

Any idea will be appreciated.

thanks,

ADA13

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COULD YOU DO THIS MATH QUESTION? tha doctor orders a pt to receive 40drops per min of D5w, The set delivers 10 drops per ml. If you begin infusing 1000mls of D5W@ 12 noon. How many mls of D5W will be remaining @3:30pm???????

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COULD YOU DO THIS MATH QUESTION? tha doctor orders a pt to receive 40drops per min of D5w, The set delivers 10 drops per ml. If you begin infusing 1000mls of D5W@ 12 noon. How many mls of D5W will be remaining @3:30pm???????

See, this is the reason I don't even care for Math because questions like this I can answer them from the top of my head, but my Pharm and High Acuity :bluecry1:

I won't answer becuase I don't wanna spoil it lol

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the remaining will be 790 by 3.30. did i get it ?

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the remaining will be 790 by 3.30. did i get it ?

No I did it in my Friday 31st thread.

I don't know for sure though, but that's the correct way I know

I also did a similar med cal in Kaplan and it was not that high

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Specializes in Medical and general practice now LTC.

There are some really good threads in the general student nurse forum discussing maths and give some examples you should check them out

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the remaining will be 790 by 3.30. did i get it ?

I'm gonna have to say I disagree with 790. It's 160ml left at 3:30

Sorry for spoiling it lol

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Ok....how did you get the 160mls, what method did you use.

according to my thread, i would like someone to tell me about the backward and front method of med math.

pls can someone help me for the explanations. i need the method with example then leave the rest for me.

ADA13..

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yeah! i agree with kgh31386, the remaining is 160ml

1st step: Desired dose (40gtts/min) divided by amt on hand or Supply (10gtts/ml) = 4ml/min

2nd step: Volume (1000ml) divided by answer in step 1 (4ml/minx60min=1hr)

Answer: 1000ml divided by 240ml/hr=should be consume in 4hrs and 10mins

1pm=240ml+2pm=240ml+3pm=240ml+30mins=120ml,

840ml consumed in 3hrs and 30mins

1000ml subtracted by 840ml

ANSWER: 160ml remaining

(remember that every 10mins is 40ml infused or 240ml in hr)

i hope sachi2 this will help! i'm trying to recall the computation we had in our school and had tried two different formula but the answer still yield the same.

i just used the formula taught by our school: D/SxQ and FR=tv/d Xdf

just used that formula and you will get the correct answer!

GOD BLESS!!!

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Ok....how did you get the 160mls, what method did you use.

according to my thread, i would like someone to tell me about the backward and front method of med math.

pls can someone help me for the explanations. i need the method with example then leave the rest for me.

ADA13..

hi! ADA, I also agree with kgh, the answer is 160ml left on 3:30pm. You can find the complete solution above. i made the effort to try to solve SACHI question, it also help me to brush up my meds computation that we used in school because i almost forgot also, i haven't review my math computation yet! it helps me 2!

Pls let me know the thread in meds computation because i don't know how to compute complicated meds/math question.

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Yep very well explained. Or you can do it this way, just cancel out the units.

You want ml right, so you cancel out the rest of the units to where you get ml by itself.

The order is

40gtt/min. So I set it up like this

40gtt x 1 ml x 60 min x 3.5hr = 840ml and 1000ml - 840ml= 160ml at 3:30

1 min` 10gtt ` 1hr

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Yep very well explained. Or you can do it this way, just cancel out the units.

You want ml right, so you cancel out the rest of the units to where you get ml by itself.

The order is

40gtt/min. So I set it up like this

40gtt x 1 ml x 60 min x 3.5hr = 840ml and 1000ml - 840ml= 160ml at 3:30

1 min` 10gtt ` 1hr

:yeah: wow! i like the way of kgh, it's easy and short cut! yeah, we are taught also that way! i just forgot! The only i can recall is the long way and i also put an explanation to make it understandable.

thanks kgh! Does anybody knows about the new BURN computation, not the rule of 9's? i've heard that they have new computation for Burn clients. Pls let me update, i wonder if NCLEX are using the new Burn Computation.

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