The Nursing Math Thread - page 22

A member pm'd me the following question highlighted below. We created this thread for you guys to talk about math, solve math problems, and post math websites that you have found helpful. I was... Read More

  1. by   live&love&heal
    i need some help trying to understand why the following calculation does not take into consideration frequency of when the medication should be administered and the weight:

    medication problem:
    the order if for digoxin 100 mcg iv q12h for a 2 year old child weighing 40 kg.
    the dose available is digoxin 200 mcg in 1 ml ampules. how much do you administer?

    i understand the set up using dimensional analysis is:
    vehicle = ml
    desired = 25 mcg
    on hand = 50 mcg

    equation set up is ml = 1ml/200 mcg x 100 mcg/ dose. answer is 0.5 ml

    my question is...why would you not take into consideration the other values i mentioned (q12h = 2 doses and 40 kg)?

    when i read medication calculation questions, i tend to over analyze, second guess myself, and get nervous that my answer is incorrect.

    thanks in advance everyone!
  2. by   beth66335
    Quote from live&love&heal
    i need some help trying to understand why the following calculation does not take into consideration frequency of when the medication should be administered and the weight:

    medication problem:
    the order if for digoxin 100 mcg iv q12h for a 2 year old child weighing 40 kg.
    the dose available is digoxin 200 mcg in 1 ml ampules. how much do you administer?

    i understand the set up using dimensional analysis is:
    vehicle = ml
    desired = 25 mcg
    on hand = 50 mcg

    equation set up is ml = 1ml/200 mcg x 100 mcg/ dose. answer is 0.5 ml

    my question is...why would you not take into consideration the other values i mentioned (q12h = 2 doses and 40 kg)?

    when i read medication calculation questions, i tend to over analyze, second guess myself, and get nervous that my answer is incorrect.

    thanks in advance everyone!
    the order is established in the question as 100mcg every 12 hours iv already, so the person that wrote the question is letting you know that they have calculated the dose based on the child's wt and age. the question has just done some of the work for you. if they needed to know how much in 24 hours they would ask about both daily doses but the question is only asking about the amount of medicine in this one dose. does that help? it is easy to add information into a question like that but just read it literally and straight forwardly to glean out only what info they want you to provide as an answer.
  3. by   live&love&heal
    Thanks beth66335 for the response. After reading it again and again and AGAIN. I now can see how it's straight forward. It's asking, this is the order. This is what you have on hand. How much are you going to give.

    I guess it takes awhile to train your eye and just read the med math questions for what they are just asking for. I will keep practicing. Thanks again!
  4. by   beth66335
    You are welcome, it took me lots of practice and 5 math tests in nursing school to get the hang of this kind of math...I'm glad I finally got it as we have to take a math test at my job now every year as part of our computer-based learning classes!
  5. by   Liebchen
    As a math dyslexic person (discalculi) I struggled with math over and over, taking every math class twice, and studying twice as long as everybody else and still only passing with a C, the very limit needed to get into nursing school.

    I am now in a nursing program, that uses a program called METI edose. It took me ten minutes to figure out IV math and how to make conversions. It took out all the guess work, and I am now receiving A's on all my math test's and finishing before everybody else. After all the years of crying and ripping my hair out, and taking medication before a math test, I now look forward to math class and have so much fun doing the calculations. I don't know if this site is available for just schools, or if anybody can join. However, if there is a cost for it... I would recommend this math program to anybody. Our instructor said that the first year they switched to this program everybody passed the math the first try, VS most everybody failing it before institution of the program.
  6. by   beth66335
    Hey I have that, I didn't know it had a name!
  7. by   Liebchen
    Quote from beth66335
    Hey I have that, I didn't know it had a name!

    I didn't either, and didn't know such a thing existed, until I went to be tested.
  8. by   sltenbroeck
    If Sally takes 4 hours to paint a house and John takes 6 hours, how many hours would it take both of them to paint the house?

    I found a really easy way to solve these problems. FInd the common denominator, then add. Flip and divide.
    1/4 + 1/6
    =3/12+2/12
    =5/12
    12/5=2.4 hours
    Last edit by sltenbroeck on Feb 13, '11
  9. by   sltenbroeck
    Quote from Alibaba
    this is more an algebra question and I can not seem to get basic understanding to solve this problem. Here is the question I found on an online study guide.

    If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?
    ....here is what I have so far,,, It seems the time to complete the project together would be less than the 4 hours Sally needs, since John is contributing although at a slower pace, but what is the actual formula to work out a solution? At first I thought maybe combining the 4 and 6 hours to come up with an average, but that's more than Sally takes alone, and therefore can not be right. I am soo confused.
    Help
    Find the common denominator, add, flip and divide.
    1/4+1/6
    =3/12+2/12
    =5/12
    12/5=2.4 hours
  10. by   NurseYi007
    Great info! Thanks
  11. by   Careopag
    Im not sure if this has been addressed....but I can't seem to get a hold of anyone from schoolwho knows. I have seen statistics as prereq on some programs...i have taken all calculus + linear alg+ differential equations because of my chem engineering degree. Is the statistics a MUST have? I would guess this is a lower level math, but people i've talked to make it seem that this math is more specific on the health professionals so i still must take it. Anyone please clear this up for me. Appreciate it
  12. by   beth66335
    Quote from Careopag
    Im not sure if this has been addressed....but I can't seem to get a hold of anyone from school who knows. I have seen statistics as prereq on some programs...I have taken all calculus + linear alg+ differential equations because of my chem engineering degree. Is the statistics a MUST have? I would guess this is a lower level math, but people I've talked to make it seem that this math is more specific on the health professionals so I still must take it. Anyone please clear this up for me. Appreciate it
    As a prereq for my nursing program I had to take either College Algebra or Probability and Statistics, which was considered a higher level math...does your catalog lay out your nursing curriculum for you? Individual programs may differ on this, I did take P&S and I found it easier for me, but nursing math is based, I have found, on Ratio and Proportion or Dimensional analysis, which I believe is Algebra and Chemistry based math. I just followed my catalog all the way through and asked an advisor about anything general, like which Philosophy classes count toward that needed credit? Do you have an college advisor? Are they a nursing instructor? If not you can call the office and ask to speak to one that is in the nursing office about specific questions on prereqs for the nursing program...hope this helps!
  13. by   CareRx
    Hey all! I am brand new to this thread.

    So I was browsing on here to learn a little more about the profession and I came across this problem. Though it was answered, allow me to just show a different way, algebraically to solve the following problem.


    If Sally can paint a house in 4 hours, and John can paint the same house in 6 hour, how long will it take for both of them to paint the house together?

    This was given earlier as a solution.

    Find the common denominator, add, flip and divide.
    1/4+1/6
    =3/12+2/12
    =5/12
    12/5=2.4 hours

    One convincing way to solve it is as follows:

    Let x = number of hours it takes 2 people to paint the house. It is a ratio problem.

    1 person / 4 hrs + 1 person / 6 hrs = 2 people / x hours

    Common denominator is 24.

    Cross multiply and you get: 6x + 4x = 24 (x cancels on this side)

    Combine like terms: 10x = 24

    Solve for x: x = 2.4 hrs

    I hope this also makes sense.

    Good luck on your nursing applications!

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