October 29, 2009
PERCENTAGE
A. DESCRIPTION:
This lesson in designed to improve students least mastered skill in the NCAE particularly "PERCENTAGE" using the Blog. Click the highlighted URL for the presentation, activity, quiz and assignment(project).
B. LEARNING OUTCOME:
At the end of the session, the students should be able to solve problems on Percentage.
C. LEARNING PRESENTATION:
http://en.wikipedia.org/wiki/Percentage
Percentage
In mathematics, a percentage is a way of expressing a number as a fraction of 100 (per cent meaning "per hundred"). It is often denoted using the percent sign, "%".
For example, 45% (read as "forty-five percent") is equal to 45 / 100, or 0.45.
Percentages are used to express how large/small one quantity is, relative to another quantity. The first quantity usually represents a part of, or a change in, the second quantity, which should be greater than zero.
For example, an increase of $ 0.15 on a price of $ 2.50 is an increase by a fraction of 0.15 / 2.50 = 0.06. Expressed as a percentage, this is therefore a 6% increase.
Although percentages are usually used to express numbers between zero and one, any dimensionless proportionality can be expressed as a percentage.
For instance, 111% is 1.11 and -0.35% is -0.0035.
D. LEARNING ACTIVITY: "Blogger Walker"
http://http//www.cis.yale.edu/ynhti/curriculum/units/1980/7/80.07.07.x.html#d
When a person dines in a restaurant the meal is subject to the sales tax. It is also customary to leave a tip for the waiter in appreciation of the services he has performed. This gratuity is usually fifteen percent of the price of the meal.
Fifteen percent of any amount may be calculated mentally by using the following three steps:
(1) Find ten percent of the amount by moving the decimal point one place to the left.
(2) Find five percent of the amount by taking one half of the answer in step one.
(3) Add the answers in steps one and two.
1. Calculate 15% of $3.89 mentally.
2. Mary bought a purse for $10.95 and a pair of shoes for $18.95. What total amount did she pay if a 7.5% sales tax was added to the price of the items?
3. Jim had luncheon downtown last week. He ordered a hamburger at $.95, potatoes at $.65, and a coke at $.50. What total amount did he pay if a 7.5% sales tax and a 15% tip were added to the price of the food?:
4. . During November Mrs. English made the following purchases at a department store.
skirt $14.95, stockings $1.98, dress $45.00, dusting powder $2.75, blouse $17.00, shoes $24.00
Find the total amount of the bill including a sales tax of 7.5% on each item.
5. Mrs. Green bought the following items at the Orange Market: 6 lb. roast beef $2.39 lb., 2 lb. coffee $3.29 lb., 3 bottles of soda .39 each (taxable item plus 5¢ deposit on each bottle), 8 bars soap 4 bars for .69 (taxable item), 1 bottle shampoo .99 (taxable item), 10 lb. potatoes $1.19. Find the total amount of the purchase including a 7.5% sales tax on taxable items and deposits on bottles.
6. Fifteen office workers are planning to go out to dinner. Using the menu below select a dinner for each person. Find the total cost of the bill including a 7.5% sales tax and a 15% tip. MENU
Appetizers
Shrimp Cocktail $4.55,
Alaskan King Crab Legs $4.55
Iced ,Cherrystones on half shell $3.50,
Clams Casino $3.50,
Baked Stuffed Clams $3.50, Entree
Whole Lobster one and onehalf lbs. $17.34,
Lobster Tails $16.25,
Fisherman’s Platter $12.45,
Baked Stuffed Shrimp $9.95,
Shrimp Scampi $9.95
Baked, Stuffed Sole $9.95,
Alaskan King Crab Legs Fra Diavolo $10.95 ,
Scallops with Lobster Sauce $9.95,
Broiled Swordfish Steak $9.95,
Reef & Beef $11.95,
New York Cut Sirloin Steak $10.75,
Filet Mignon with Stuffed Tomato $12.95,
Prime Rib Au Jus $9.95,
Roast Leg of Spring Lamb $9.95.
The above served with Salad Bar, Baked Potato, Vegetable, Soup and Coffee
E. LEARNING EVALUATION/QUIZ:
a.) Quiz 1: http://www.saab.org/mathdrills/percent.cgi
F. ASSIGNMENT/PROJECT:
Make a brochure about the widely-used body mass index (BMI).
Demonstrated by:
MA. DINAFIL T. BONCALES during the Three-Day Inservice Training for Secondary Mathematics Teachers on Integrating ICT, Consumer Education and Creating Student-Centered Learning Environment held at Computer Room,Iligan City National High School
last October 27-29, 2009.
Ma. Dinafil T. Boncales
Demonstration Teacher
Observed by:
EXQUIL BRYAN P. ARON,
Master Teacher I
Iligan City East High School-Sta. Filomena
Attested by:
LUCITA B. PAGENTE
ES I- Secondary Mathematics
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