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# Nur 283 Hy Math Review

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• 1. Math Review
NUR 283HY
• 2. Abbreviations
Review acceptable and non-acceptable abbreviations
Pharmacology book
Fundamentals book
Kee & Marshall
Inside front cover
Chapter 3, pg. 68-70
• 3. Rounding
NOTE: Don’t round until you have completely finished the problem
Rounding within the problem will
but not an exact one
• 4. Rounding
To round to the nearest tenth,
carry out the division process to
hundredths place (2 positions to the right of the decimal)
3/8 = 0.37
1/3 = 0.33
3/4 = 0.75
• 5. Rounding
Next, look at the number in the hundredths place
If the number is less than 5, then round down
0.33 rounds to 0.3
If the number is 5 or higher, then round up,
0.75 rounds to 0.8
0.37 rounds to 0.4
• 6. Volume and Concentration
Meds are given to clients in some type of volume
(ml, tablets, capsules, mEq, units, etc.)
Concentration indicates the amount of medication in a given amount of solution (mg/ml, units/ml, mg/tablet, etc.)
• 7. Conversions
Remember a conversion = 1
It can be used in an equation with either number as the numerator or denominator
The unit of measure is BEFORE THE NUMBER in the apothecary system
The unit of measure is AFTER THE NUMBER in the metric and household systems
• 8. Common Metric Conversions
Metric:
1 kg = 2.2 pounds (#)
1 kg = 1000 g
1 mg = 1000 mcg
1 g = 100 mg
2.54 cm = 1 inch
• 9. Other Common Conversions
Apothecary:
1 grain = 60 mg
Remember ss = ½ grain
Household:
1 teaspoon = 5 ml
30 ml = 1 ounce
3 teaspoons = 1 tablespoon
• 10. Basic Formula
D x V = amount to be given
H 1
D = desired dose (what client is supposed to receive)
H = dosage you have on hand
V = volume or vehicle that the dosage on hand is in
‘D’ and ‘H’ must be in the same unit of measurement
• 11. Setting up Problems
Use the label factoring method (dimensional analysis – DA). This method uses labels with the numbers to arrive at the correct answer
(Kee pg. 92- 104)
Determine unit of measurement for answer
Set up problem until labels cancel out and you are left with correct label for the answer
• 12. Dosages based on Weight
Drugs may be ordered based on the weight of the client
(amount of mg of the drug per kg of weight)
When converting weight in pounds to weight in kilograms, the number is approximately less than ½ of the weight in pounds
110 # = 50 kg; 220# = 100 kg; 140# = 63.6 kg
• 13. Divided Doses
You may have a problem that asks you to calculate the entire amount of drug that is to be given in a 24 hour period
A problem may give you the amount of drug the client is to receive in 24 hours and ask you to calculate an individual dose
• 14. Reconstitution of a Drug
A problem might give you a great deal of information about reconstituting a drug – how much diluent, vial size, etc. (Kee pg. 186)
The bottom line is to recognize the final concentration
Order for 1.5 g of penicillin IM q6h. The pharmacy sends a vial labeled penicillin 5 g/vial in dry form. Reconstitute with 5.6 ml of sterile water to yield 1000 mg/ml. How much should be given?
• 15. Hints for Taking Quizzes