Negative number and Algebra

For the end of this years, we had started with basic Algebra and a topic about Negative number. It seems easy but it is kind of tricky because there are replacements for numbers to letters and there are different ways to add and subtract to negative numbers.

 

For algebra, when you make a letter to represent a number you can’t use this “x” as a symbol as multiply. Instead, you can use “3*x”, “3•x”, “3(x)”, or you can just write the number near to each other like this “6x” and it all means the same. If you have a problem like this “x*x*x*x*x”, you can write it in a short cut like this “x” so it is much easier. To give a letter value, you can do this “x = 4”. Therefore, you can do any problem like “4+x-3 = 5”. This is just the basic of algebra so I expect that it will get harder as it goes.

Above is the integer number line that shows where are the negative integers and the positive integers. As you can see, the positive integers go from zero to the right and for the negative integers, it goes from zero to the left. If you see the number like this “-3”, you would call it negative three not minus three.  If you have this number “-2 + 3”, it will equal to 1 because when you take a negative number to add it with a normal number, it would go from left to right. However, if you subtract it, it would go from right to left.

 

That’s pretty much it, it is not that hard but I think that it is good to practice the basic because is important for when we learn something higher in the future.

Percentage and Angle

                           Percentage and angle are both important to me. I think that in the future I will use percentage and angle in some way. For me, the percentage can be used in real life a lot such as a tax, a discount on some product that I would buy, the increasing or decreasing of my salary, and a lot more. For the angle, I can use it if in the future I will be an engineer or a math teacher, or even in my grade test. During the process of learning, I also get a lot of struggles. For percentage, it is hard to convert fraction to a percentage because for fraction we need to simplify it a lot. Angle is also hard because the problem that I am working on is not drawn for scale, so we have to do a lot of critical thinking to solve the problem. After a lot of struggles that have been through, I learn a lot and I can think quickly on problems. Finally, I hope that percentage and angle would be useful for me in the future.

Decimal

Decimal

 

               In the third round of the year, I was focusing on decimal. I learn about adding, subtracting, multiplying, and dividing decimal. For adding and subtracting is easy, you just put the point on top of each other and do the adding or subtracting. Example:

          23.9        46.99

       +  8.7        – 31.30

         ——–    ———-

          32.6         15.69

               For multiplying and dividing is kind of tricky, there are multiplying and dividing decimal with decimal and decimal with the whole number. Multiplying decimal with whole number and decimal with decimal are pretty much the same, you don’t have to put the point on each other but after you do the multiplying you have to count the digits after the point. Ex:

               Dividing is also hard. First, you do normal dividing but when you come to the dot, you have to put the point right on the top of it. Ex:

                Overall, I like decimal because it is kind of easy and it helps me with a lot of word problems in class. I’m not really good at it but I can understand it and know how to do it well.

Geometry and Ratio

      Geometry is an important lesson in math and it can be used for engineering, architecture, graphic design…. In the class, I learn about finding the area and the perimeter of the triangle, square, rectangle, and parallelogram. Through the lesson, I face a lot of challenge because there are many shapes and formulas and especially the triangle. However, my math teacher had given everyone a website call khanacademy(http://khanacademy.org) to work on. It a website where the teacher can put any assignment about any subject for us to do. Moreover, If you don’t understand it you can go to watch some videos where they explain to you about the topic.

      Ratio is using math to compare things. For example, if you wanted to compare the number of Female and male in the world you also can use the ratio to do it. In ratio, we use “:” to represent the word “to” like“ 3:4 ” you call it “three to four”.Even though the number is big, you can simplify it in a smaller fraction. Example, if you a have “12:24” you can simplify it in to “1:2” so it makes us easier to compare it.

       After all, I learn a lot of things that can apply it to my everyday life or to the future. if I am an engineering in the future, I can use geometry to help me with it.

Fractions

Math is very important for me and it also very useful for everyone. Math can be used in science, economic, technology, chemistry and more classes. In the past few week in my math class, I learn a lot about fraction and word problems. I learn about how to plus, subtract, multiply, and divide fraction and fraction.

For me fraction is not too complicated but for word problem that have to do with fraction in it is a little complicated because sometime it is a bit tricky and I have to draw some picture for me to understand it more. Just so you know I am a visual learner so almost all of the this I do I usually draw pictures.