# Math help

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1. This is a discussion on Math help in Nursing Student Assistance, part of Nursing Student ... I am practicing for my med calc test that is next tues. I am AWFUL at it. Right now, we are just...

I am practicing for my med calc test that is next tues. I am AWFUL at it. Right now, we are just doing the dose desired/dose on hand X Q I get the easy ones and know how to convert mg to g and that if needed ... but I cam across this one and not sure where to go with it...

Aluminum hydroxide 15cc is ordered qid.
Pharm sends a bottle lableled 320mg per 5 ml.
How many mg is the pt getting with each 15 ml?

I am not seeing it. Thanks!!
Last edit by Joe V on Sep 24, '12 : Reason: capitalization

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4. Tell us how you would set it up and we can help you from there.
5. Would it be 960mg? ??
In 5ml theres 320mg
The order is 15ml
5x3=15ml
320x3=960mg

960mg

Pls Correct me if im wrong.anybody?

I also need to master this calculations
KelRN215, loriangel14, and Esme12 like this.

DosageHelp.com - Helping Nursing Students Learn Dosage Calculations - Dosage Question Steps
http://www.davesems.com/files/drug_d...lculations.pdf
aluminum hydroxide 15cc is ordered qid
pharm sends a bottle lableled 320mg per 5 ml
how many mg is the pt getting with each 15 ml

There are questions you need to answer for every problem
Desired dose
Concentration
Volume on hand
Any conversions: Lbs/Kg, grams/mg, mg/mcg
looking for:

Desired dose: 15cc
Concentration: 320mg/5cc
Volume on hand: N/A
Any conversions: 1cc=1ml
looking for: ?mg per 15ml

320mg X 1cc
5cc ?mg = so you have _____mg per cc

If you have _____mg per cc how many mg's are there in 15cc

____mg X 15cc = mg/15ml
1cc
Last edit by Esme12 on Sep 20, '12
7. Would it be 960mg? ??
In 5ml theres 320mg
The order is 15ml
5x3=15ml
320x3=960mg

960mg i can see it this way better.....

Concentration: 320mg/5cc
Volume on hand: N/A
Any conversions: 1cc=1ml
looking for: ?mg per 15ml

320mg X 1cc
5cc ?mg = so you have __64___mg per cc

If you have __64___mg per cc how many mg's are there in 15cc 960...this way confuses me

oh boy...i dont like this...what am i going to do....i am LOST
8. Since the ordered dose is 15 mL or 15cc and what you have on hand is 320mg/5ml, in order to figure out how many mg are in 15 ml you need to multiply the 320mg by 3 to get your answer. You would multiply by 3 because since you have to multiply the 5mL by 3 to get 15mL you also need to do the same for the mg.

Ie:
320mg/5ml

15ml/5ml = 3 ml; multiply 320mg x 3 = 960mg in 15 ml.
DawnJ likes this.
Quote from momtojosh
Would it be 960mg? ??
In 5ml theres 320mg
The order is 15ml
5x3=15ml
320x3=960mg

960mg i can see it this way better.....

Concentration: 320mg/5cc
Volume on hand: N/A
Any conversions: 1cc=1ml
looking for: ?mg per 15ml

320mg X 1cc
5cc ?mg = so you have __64___mg per cc

If you have __64___mg per cc how many mg's are there in 15cc 960...this way confuses me

oh boy...i dont like this...what am i going to do....i am LOST
That's ok .........then don't use it....it's dimensional analysis (algebra). I just broke it down to how many mg are there in 1cc. So if you have 64mg in 1cc and you have 15cc's you multiply 64 X 15 = 960.

Try both of these sites.....DosageHelp.com - Helping Nursing Students Learn Dosage Calculations - Dosage Question Steps
http://www.davesems.com/files/drug_d...lculations.pdf
10. esme12...thank you for the websites...i was up til 11 practicing last night. math is very hard for me,i cant see what other people are seeing. my husband is a math wizard and he helps me "see" the problem better.
i will let you know how my first calculations test goes....every semester we have one...the first we need to pass with an 85 or better,then 90,95 and 100% in the 4th semester...we do get three tries but i would like to get it on the first and breathe a sigh of relief!!

thanks again!!
good Luck!!!!! I'm sending positive vibes!
The Short List 1 cup (c) = 8 ounces (oz)
1 dram (dr) = 60 grains (gr)
1 dram (fl dr) = 60 minims
1 gallon (gal) = 4 quarts (qt)
1 glass = 8 ounces (oz)
1 grain (gr) = 64.8 milligrams (mg)
1 gram (g) = 15.43 grains (gr)
1 inch (in) = 2.54 centimeters (cm)
1 kilogram (kg) = 2.2 pounds (lb)
1 liter (L) = 1.057 quarts (qt)
1 milliliter (mL) = 16.23 minims
1 minim = 1 drop (gt)
1 ounce (oz) = 2 tablespoons (tbsp)
1 ounce (oz) = 8 drams (dr)
1 ounce (fl oz) = 29.57 milliliters (mL)
1 pint (pt) = 16 ounces (oz)
1 pound (lb) = 16 ounces (oz)
1 quart (qt) = 0.946 liters (L)
1 quart (qt) = 2 pints (pt)
1 tablespoon (tbsp) = 3 teaspoons (tsp)
1 teacup = 6 ounces (oz)
1 teaspoon (tsp) = 4.93 mL

The Long list
1 central = 45,359 grams (g)
1 centimeter (cm) = 10 millimeters (mm)
1 cubic centimeter (cc) = 1 milliliter (mL)
1 cup (c) = 8 ounces (oz)
1 drachm = 3.55 milliliter (mL)
1 dram (dr) = 60 grains (gr)
1 dram (fl dr) = 60 minims
1 gallon (gal) = 4 quarts (qt)
1 gill = 4 ounces (oz)
1 glass = 8 ounces (oz)
1 grain (gr) = 64.8 milligrams (mg)
1 gram (g) = 1,000 milligrams (mg)
1 gram (g) = 1,000,000 micrograms (mcg)
1 gram (g) = 15.43 grains (gr)
1 hand = 4 inches (in)
1 inch (in) = 2.54 centimeters (cm)
1 kilogram (kg) = 1,000 grams (g)
1 kilogram (kg) = 2.2 pounds (lb)
1 liter (L) = 1000 milliliters (mL)
1 liter (L) = 1.057 quarts (qt)
1 meter (m) = 1,000 millimeters (mm)
1 meter (m) = 100 centimeters (cm)
1 milligram (mg) = 1,000 micrograms (mcg)
1 milliliter (mL) = 1 cubic centimeter (cc)
1 milliliter (mL) = 15 drops (gt)
1 milliliter (mL) = 16.23 minims
1 minim = 1 drop (gt)
1 ounce (fl oz) = 2 tablespoons (tbsp)
1 ounce (oz) = 20 pennyweights (dwt)
1 ounce (oz) = 24 scruples
1 ounce (oz) = 31.1 grams (g)
1 ounce (oz) = 480 grains (gr)
1 ounce (oz) = 8 drams (dr)
1 ounce, fluid (fl oz) = 29.57 milliliters (mL)
1 palm = 3 inches (in)
1 pennyweight (dwt) = 24 grains (gr)
1 pint (pt) = 16 ounces (oz)
1 pint (pt) = 4 gills
1 pound (lb) = 16 ounces (oz)
1 pound (lb) = 350 scruples
1 quart (qt) = 0.946 liters (L)
1 quart (qt) = 2 pints (pt)
1 scruple = 20 grains (gr)
1 stone = 0.14 cents
1 tablespoon (tbsp) = 3 teaspoons (tsp)
1 teacup = 6 ounces (oz)
1 teaspoon (tsp) = 60 drops (gtt)
1 teaspoon (tsp) = 4.93 mL