1,000,000 microliters (not common in practice)0.1 L100 mL0.001 L1 mLIt’s your turn to practice applying equivalents. Interpret the following examples:1.1000 mg = _____ g2.1 tsp = _____mL3.15 mL = _____ tbsp4.1 oz = _____ mL
2
5.
65 mg = gr
_____
6.
1 kg = _____ lb
7.
480ml = _____ pt
Part 1I – Calculations
The time has come to learn how to use what you have learned to calculate doses. We will
start with types of formulas and then move onto applications.
Ratio and Proportion
A ratio is an expression of a relationship between two measurements. A ratio can be
expressed as a fraction or decimal.
Example: 1:3 can be expressed as
1
3
∨
1
÷
3
=
0.75
It’s your turn to practice expressing ratios as a fraction:
8.
2:3 = _____
9.
5:7 = _____
It’s your turn to practice expressing ratios as a decimal:
10.
5:10 = _____
11.
1:5 = _____
A proportion is used to determine if two ratios are equivalent.
Example:
1
2
=
6
12
or
1:2
=
6:12
To check a proportion, just calculate for each side of the equal sign.
Watch Solving a Proportion (0:56 min):

matic.com/watch/cqjnFtOHin
It’s your turn to practice checking proportions:
12.
8:10 = 2:4
Is it equal? _____
13.
5:6 :: 1:3
Is it equal? _____
3
You can also use proportions to solve for an unknown value.
Watch Solving for an Unknown Proportion (1:23 min):

matic.com/watch/cqjnqnOHQS
It’s your turn to practice solving for an unknown:
14.
3:10 = 10:x
x = _____
15.
5:6 = x:30
x = _____
Fractions
A method for solving more complicated problems (multiple steps). The benefit to this
method is to keep track of your units.
Example: 0.65 g = gr 10
Formula Based Practice
Formula based calculations use a formula to calculate for a
specific outcome.
Dosing formula
DO
DH
xQ
Example 1: A physician orders 500mg of cephalexin by mouth STAT. Your office has 250mg capsules onhand. How many capsules would you give your patient?
4
What does it mean?
DO = Dose ordered
DH = Dose on hand
Q or V = Quantity of dose on hand
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 Winter '17
 D. Nolder
 Kilogram