S: Math Scrapbook- 7th Grade
BC: The End | *created by: alyssa stokes*
FC: *find out about discounts, sales tax, tips, percent of increase and decrease, and interest inside... | Using percentS In math! Real life examples on how you use them everyday...
1: You might think learning some things in math are pointless....like percents. But actually you use percents in everyday life!
2: SHopping...everyone loves to!! Everyone also likes it when things are on sale, or have a discount! Surprisingly something having a discount is working with percents!
3: when a store/item has a discount it means that there is going to be a percent off the items original price. | For example: if a shirts original price is $16.38, and it's 50% off, you would divide $16.38 by 2, so that would come out to be $8.19. (hint: when dealing with percents, #'s are always out of 100.)
4: nobody likes tax! Tax is an additional amount added to your subtotal each time you go shopping. So for example: you go shopping and buy a shirt and a pair of shorts. You subtotal is $19.32. your subtotal is the amount you would pay before they add tax. So after they add tax, your total would be $20.82. They do 7.75% (which is the sales tax in North Carolina) times your subtotal,which gives a #, then u add that # to your subtotal & thats how they get your total!
5: everyone likes it when it is tax free weekend...but that's only one weekend out of the year!
7: It's very nice to leave a tip when leaving a restaurant where you have been served. Sometimes people leave a certain percentage, Like some people will leave 20%, some will leave 15%. Lets say I went to eat with my family, and our total was $34.87. My family usually leaves a 20% tip. so you would times your total by the percent you are going to leave, you get a small #, so you then add that # to you total. So my families new total would be $41.81. (your total only goes up depending if you leave a tip or not!)
8: A number that has increased over a period of time and... | then has been converted into a percent. | Percent of Increase=
9: For Example: if yesterday there were only 24 people in math class, and today there were 30. the amount of increase is 6. So you would divide 6 by the original amount, which is 24. when you do that you get .25. form there You move the decimal place over 2 places to the right, so you get 25. so you would say, today there was 25% more students in math class.
10: A # that has decreased over a period of time, and then has been converted into a percent. | percent of decrease!
11: example: if there were 25 lollipops in the jar yesterday, and there were only 21 today. the amount of decrease is 4. so you divide 4 by 25 (original amount) & you get .16, so you move the decimal place over 2 places and you get 16%. | you do the same math steps as percent of increase! | so would would say there was 16% less lollipops in the jar today, then yesterday.
12: example: formula= i=prt *principle= $550 *rate= 4.2% *time= 7 months (you times all those numbers together). I= 550*4.2%*7/12 ( 7/12 because 7 is your time, and there are 12 months in a year). i= $13.5 ( always round to the nearest penny).
13: money paid on a loan, or money earned on the money you have in the bank.