I think that the most exciting math lesson this year would be quadratic functions and quadratic equations. It seems interesting how you can know how high or how fast, an object is going, and get an accurate prediction when it will reach the vertex, the maximum or the minimum. I feel very nervous about the CSTs. They are coming up very soon, and on the previous ACS, there were somethings I didn't know such as parabolas and quadratic functions. Thank God we're not being tested on radicals. Mr. Erickson said that he was going to teach us radicals after the CSTs since we weren't tested on them. I still want to learn radicals anyway. Just in case they do show up on the CST.
Quadratic functions are everywhere. If you see an arch, there will be a mathematical equation. You will see an arch below, and there is a quadratic equation for it if someone ever wanted to know it. The arch below is an example of how quadratics are used in real life.
The best way to do show you my methods of conversion is through showing them to you. Let's use .54 as an example. The first thing is to move the decimal over 2 places to the right and put it over 100. This gives you 54/100. The next step is to divide both the numerator and the denominator by the same number. I will divide by 2. This leaves us with 27/50. This can not be simplified. We are now done. I will show you another example.
This time I will use 80/100. I will divide the numerator and denominator by a common number. Since both the numerator and the denominator are divisible by 10, I will divide 80/100 by 10. This leaves us with 40/50. Since both the numerator and the denominator are divisible by 10, I will divide them by ten leaving use with 4/5. Instead of dividing twice, I could have divided 80/100 by 20 which would have left use with 4/5. In my opinion, this is the best method to converting decimals to fractions, and this is the only method I know. If there is a different method please post this method in the comments, and also if you like this method more than the method you were taught; please let me know in the comments.
The first method is Renaming. It is when you multiply the fraction until it begins with 1, and is a multiple of 10. Such as 10, 100, 1000, 10000, and etc. I do not prefer this method. I prefer the division method. It is when you divide the numerator by the denominator. I will now demonstrate both methods. The first method, I will use 4/25. I will multiply it by 4 which gives me 16/100. This method may seem really good, but what will you do when you get a number like 4/7.
You would have to multiply 4/7 by a number like 14.2857142857. Numbers like these are really ugly. Now, I will demonstrate the second method using 4/25. 4 divided by 25 is 0.16. This method is easy to use with numbers like 4/7 as well. 4 divided by 7 is 0.57142857142. This number is long, You would have gotten the same answer through both methods. It is a matter of how you get there. The second method is a lot faster and efficient. I personally prefer this method since this method is a lot easier.
I would personally use a ratio. An example of a ratio would be 5 cherry red lollipops : 2 green apple lollipops. This means that your cherry red lollipops sell 2.5 times as much as a green apple lollipops. The percent would be 250% cherry red lollipops. How do you get 2 1/2 lollipops? You don't that is why you would use a ratio. If you say 500 percent than it would be 5 lollipops to 1 lollipop. This is why ratios work better than percents.
In my opinion, percents are best things with discounts such 25% of a $100 jacket. A ratio would be 75:100, and therefore in this situation, a percent would be better. But since the blog topic is on which is better to use when buying food, I would have to say ratios.
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