Fractions
Multiplying Fractions
1/2 X 1/3?
Answer:
1/6
Multiply the numerators
1 X 1 = 1
Multiply the denominators
2 x 3 = 6
Ans: 1/6
Convert percentage to Ratio
75%
Answer:
3:4
Military Time Conversion
3:30 PM
Answer:
1530 hours
How many milligrams in 2.5 grams?
Answer:
2500 grams
1 gram = 1000 milligrams
2.5 x 1000 = 2500 mg
How many milliliters are in 1 cup?
Answer:
240 milliliters
What is 2/5+1/10?
Answer:
1/2
Common denominator : 10
2/5 2 x2 = 4
2 x 5 = 10 4/10
1/10 = 1/10
Add:
4/10 + 1/10 = 5/10 simplify 1/2
Convert ratio to decimal
2:5
Answer:
0.4
Divide the numerator by the denominator
2 ÷5 = 0.4
Standard Time Conversion
2300 hours
Answer:
11:00 PM
How many cups are 3 quarts?
Answer:
12 cups
Since 1 quart = 4 cups
3 quarts = 12 cups
An infant's weight is 15 lb. How much does the infant weigh in kg?
Answer:
6.8 kg
1 lb = 2.2
15 ÷ 2.2 = 6.818 kg = 6.8 kg
What is 3/8 x 2/3?
Answer:
1/4
Multiply the numerators
3 x 2 = 6
Multiply the denominators
8 x 3 = 24
So the product is 6/24
Simplify the fractions
6/24 = 1/4
If the ratio of dexamethasone is 1:4 in a 100 ml oral suspension, what is the percent?
Anwers:
20%
Find the fraction of active ingredient
1/ 1+4 = 1/5 = 0.20
0.20 x 100 = 20%
Change temperature from Fahrenheit to Celsius
97.8° F
Answer:
36.6° Celsius
C= 5/9 x (F - 32)
Subtract 32 from Fahrenheit
97.8 - 32 = 65.8
Multiply by 5/9
C = 65.8 x 5/9 = 36.56°C
36.6°C
3 gallons of milk- how many pints is that?
Answer:
24 pints
1 gallon = 8 pints
3 gallon x 8 pints = 24 pints
A prescription calls for aspirin 325 mg. How many grains each tablet will contain?
Answer:
5 grains
1 mg= 65 grains
325mg ÷ 65 grains= 5 grains
Subtracting Fractions
3/4 - 1/6?
Answer:
7/12
Find a common denominator: 12
3/4 = 3 x 3 = 9
4 x 3 = 12 9/12
1/6 = 1 x 2 = 2
6 x 2 = 12 2/12
Now subtract
9/12 - 2/12 = 7/12
Add decimals
.75 + 1.0007
Answer:
1.7507
1.0007
+ 0.7500
--------------------
1.7507
Change temperature from Celsius to Fahrenheit
7°C
Answer:
45° F ( 44.6 F)
F = 9/5 x ( C + 32)
Multiply by 9/5
7 x 9/5 =12.6
Add 32:
12.6 + 32 = 44.6 will round up 45° F
In household system of volume measurement, 1 fluid ounce is equal to how many tablespoons?
Answer:
2 tablespoons
Levothyroxine 250mg/5ml is available. If the patient receives 15 ml, how many milligrams will they get?
Answer : 750 mg
Find 1 mg in 1 ml
250÷ 5 = 50mg per ml
Now multiply by 15 ml
50 x 15 = 750 mg
Dividing Fractions
1/2 ÷ 1/4
Answer :
2
Keep 1/2
Change: ÷ to X
Flip : 1/4 to 4/1
Now multiply
1/2 x 4/1 = 4/2 = 2
What is 92.63 -12.0007?
Answer:
80.6293
92.6300
- 12.0007
----------------
= 80.6293
Convert 0900, 1300, 1700 to Standard Time
Answer:
9:00 AM
1:00 PM
5:00 PM
You need to dispense 500 ml of a liquid preparation. if the dose is 2 tsp, how many doses are in the final preparation?
Answer:
50 doses
2 tsp= 10 ml
500ml ÷ 10ml = 50 tsps
Using allegation method answer the following question
To prepare 80 ml of 20% dextrose using 50% and 10% solutions. How much of each is needed?
Answer:
20 ml of 50%
60 ml of 10%
50% 10 x 2 = 20 ml of 50% needed
20%
10% 30 x 2 = 60ml of 10% needed
40ml ÷ 80 ml= 2