Algebra Express

This page is for my Math Class Projects and Pictures!

October 9, 2014

My Back to School Project was about how much money I cost per day. We gathered information from our parents and bills and finally we added up all the information. Our class used 180 days for the total number of days to divide. But the most important thing was to use all the operations; addition, subtraction, division and multiplication.

First I asked my mom, dad and gathered some information about the costs of several things from the planner and the internet (cost of my laptop). I divided the expenses from the hostel by two because my mom and I stay in one room and there are seperate expenses for each room. My brother's uniform cost was subtracted from the bill. After getting all the expenses I divided the data by 180 (number of days in the school year) and then I added the total. Finally, I rounded the total, so the total value is approximate.

I do buy a lot of useless things and I don't really even use it! I was shocked when I learned that I spent 3,655 Baht per day. I've been going to RIS since 2nd grade, but I've never realized how much I spend on school alone. It's not only the school fees but also stationary, uniform and others! I spent money on watches, glasses, hairbands, bracelets, socks, shoes, and jackets. So I’m going to try and reduce the amount of money that I use per day. Next year I will not buy a uniform. This year’s uniform is big enough for me and it’s not like I’ll have a sudden growth-spurt since I am very short and I have barely gained height since 6th grade. I don’t really need that much stationary since we have enough and I don’t really need to buy it every year. For some reason, I buy a watch every year despite the fact that my watches are usually just fine, so next year, I’m going to use my watch from this year. In this project, I learned that I’m not that good at making good posters. And of course that I can easily gain data if I wanted to.

My Mom’s Response:

She thinks that it’s good for me to know about the expenses. Children should know about how much the family adults work to help the kids have a comfortable life. And the kids sometimes get lazy and they don't work hard in High School for a scholarship because they believe that their parents will pay for them. So they don't even try to work hard!

Red: Introduction
Purple: How Data was Collected [what I did]

Blue: What I will Do to Reduce Expense Per Day

Green: My Mom’s Response

Picture of my Back to School Project:

_________________________________________________________________________________

Real-Life Percent Example 

In Math Class, we are researching real-life percent or ratio and proportion examples such as articles. I chose the "Falling Prices Boost Gold Demand in India" by the Times of India newspaper. It talks about the price of the gold in India reducing. People are buying a lot of the gold because the prices have fallen. Retail buyers are a part of this shopping spree. Due to this the value of rupees against US dollars are going down fast. The gold shops were a huge part of the Indian Economy and due to the lowering of the cost of gold, the Indian Economy is going down. The demand for gold was much lower last year because of the RBI(Reserve Bank of India)'s restrictions. They had clamped down on the gold dealing considering the high CAD[Current Account Deficit] (the high amount of trading) that was taking place. The RBI had initiated the 80:20 scheme in August last year. That means 80% of the gold could be bought by the local people and 20% would go to trade. Shah, as noted in the article, says that people should take a long-term view [atleast 3 years] on gold since awhile later the prices would go up again.

Percents, ratios and proportion are an extensive part of this regulation. The RBI has initiated the 80:20 scheme in August last year. It is a ratio. 80 to 20 or 80/20. The locals are getting the larger amount of this as shown in the ratio. The 20% shows that trade has 4 times less gold than the locals. The current population of India [updated on November 2nd, 2014] is 1,261,850,000 and is now 17.5% of the world population. It's a lot. Even if some people don't buy the gold, others are and most people would. And if all them want to buy gold, the prices are going to reduce quite a bit perhaps lower for over three years. If you visit the Gold Rate, then you'll see that the rate of Gold in certain cities of India. Today the Indian Economy is $1 to 61.59 Indian Rupees.

Article Link: Falling Prices Boost Gold Demand in India

2013 Indian Rupees to US Dollars

_________________________________________________________________________________

My Understanding of the Concept of Probability

When we were near the end of learning about Probability, we were given a project; a probability project. You see, there are two types of probability, theoretical and experimental. Of course there's also the compound probabilty which consists of independent and dependent and then there's ratios and percent.  We had to find the theoretical and experimenal probability of an independent compound probability of an experiment that we had to conduct with one probability. To be more specific, I did Battle Spirits Cards. And I had three different variables; colour, number, and the special glittery cards. There were 2 colours; blue and green. The numbers varied from 1-6. There were 2 special glittery cards, 1 blue, 1 green and both were #5. I counted every card of each variable and catogorised it as #colour. Of course the specials were also a part of this. I simply had to shuffle it later and replace the cards and then note the #colour%special/ordinary. Later I counted how much of each catogory; # then colour and then the specials.

Special, # and Colour

Back of the Cards

First of all, Probability is not a guess. It is far more educated and precise to be a guess. A guess is when you choose randomly out of all the possibilties. Probability is when you calculate using all the variables in question. Variables include; theoretical, experimental, compound; independent and dependent as well as the other variables which depend on what you're trying to calculate. There are formulas and you actually have to tally and work out the answer of the possibility and as I have said before, this is more accurate but this is due to the calculations. 

History of Ebay and Amazon for Investments

SAT Scores by Family Income

There are many ways that this can be used in real life. For example, investments; you have to know and calculate how much profit you can get if you invest in them; so you need their profit in a year and so. Detectives calculate the criminal activity so that they can see if there's any criminal who's doing something or to calculate robberies, they find clues and thus use it to calculate the probability of finding the criminal at a certain place and time. Actors and Actresses calculate if their movie will be famous and can bring money. People who work in production companies calculate the probability of people buying things from them, if there are any defects and how much they need to make in a year/month/week. If you are starting a business, then you need to calculate the probability of earning enough money to buy the necessary objects to keep increasing the customers and if you can succeed. Also teachers need to calculate the probability of averages, so that they can figure out which is meeting standerds, which is below meeting standerds, are they improving, exceeding standerds and so on. Doctors choose which medicine/treatment is good for patients. There are also betting standerds that has to be met.