## Negative Numbers, (-1 and -2)

Negative numbers are the essential part that we use in everyday life, without realizing. Within this round, we learned about the negative numbers that some of us have known before but this lesson could remind us, too. I have learned it in the past, but I forgot some of the basic things in the negative numbers. Negative integers are used to represent things as temperature, money purpose, and etc.

## The Study of Percentage

20% is equal to 0.2

With this round, percentage is what we have learned and practiced. I like learning about percentage because there are numbers and we can use fraction and decimal in this lesson. Percentage is developing the world to be easier in some ways. It makes people life easier in knowing what is the overall number of what number. For instance, 100% is the overall number of percentage so if you have 20% of all the candy in the shop which means that you have 20% of 100%. Compare to whole number, that you have 65 candies of all the candies in the shop. As we can see, the information that they provide is not sufficient which means we don’t know the overall candies in the shop. Therefore, percentage is the way easier in usage for the world of math. However, if we would like to know what is 20% equal to, the requirement is rather to know the overall percentage is equal to whole  number or the remaining candies in the shop which is 80% is equal to whole number. If 100% is equal to 50 candies so how can we find 20%. In addition, 20% of 100% is alike 20% of 50 candies. As I said before, fraction and decimal are all relate to fraction so we can change 20% to fraction and as well as decimal. Then we got 20/100 or 0.2 and because 50 is the whole number of 20% so we take 50 times 20/100 ( 20% ). After that, we got 10 which also means we buy 10 candies out of 50 candies in the shop. Clearly, we could understand how percentage made world easier. Also, we have practiced transferring decimal to percentage and percentage to fraction and decimal. It made me clearer after practiced some of the exercises. Overall, I have enjoyed studying percentage that I assume would necessary for any situations.

## Decimal

Within this round, we are up on the next level which is Math 5 B. In the first lesson, we were learning about decimals and that is what the students have been learning last year too. This lesson is to remind us the what are the importance of decimal. Decimal stands after a decimal point to the right of the whole number. The number that stands next to the right of the decimal point is in tenth place and then hundredth and then thousandth. We’ve also known the way to convert fraction to decimal and decimal to fraction ( picture below). ## Mathematics Round 2

### Geometry

Talking about Geometry, in Math class this round we have learned geometry. There are two things we learned which are area and perimeter. We have done a lot of exercise in workbook especially about area and perimeter. Area is the measurement inside the shape and perimeter is the measurement outside of the shape. Different kind of shapes have different formulas (formulas are below). At last, I am joyful with the lesson. ### Ratio

Ratio is the comparison between two things or more than that also possible. Ratio can use with fraction and whole number.  For instance you want to compare 4 oranges to 5 apples. It will be 4:5. In ratio we use the word “to” for comparing two things. As we can see the instance above said they compare 4 oranges to 5 apples so we use this “:” instead of to. Just to add on, if the numbers are big we can simplify it. For another example is, compare 10 books to 5 pencils. That is 10:5. In this case we can simplify it to 2:1 because we take 10 divided by 5 and 5 divided by 5. Despite we simplify it, still it has the same value.

After learning about ratio, I realize that we can use ratio to make life much better. Whenever we want to compare two or three things or more than that, quick thing is ratio is our choice.

### Surface area

This is also a part of the lesson we learn. Surface area is the sum of all areas of all faces. For demonstrate regular prism has 6 faces. To find surface area we will find area of each 6 shapes and plus together. Sometimes we need a little long time to figure out the surface area because we need to know the area of all 6 faces but we only need to find 3 faces area because 3 more faces will have equal area. Then we can take the 3 faces area times two and we will find surface area.

## Math Fractions

I love math class because in the world we actually really need math. Let’s think about it first, seller needs math, customers need math, eating need math. Therefore everything need math. The math books that we are studying today are all from Singapore. We have finished in grade 4A and 4B. Now we are continuing to finish 5A. In this round we understood a lot about order of operations. Order of operations are Addition, Subtraction, Division and Multiplication. We have been doing exercise about order of operations and word problems with our group. We were not just learned about order operation but also about fraction. Fraction is not like whole number. Fractions have numerator which is the top one of the fraction. There is a line in the middle of the fraction. Fractions also have denominator which is below the line of fractions. Addition fractions, Subtraction fractions and Multiple fractions. We are doing the exercise in class with the groups that teacher has divided us in. Well I am so happy to learn about fraction because teacher told us some new strategies that we don’t know. Here is the picture of Math grade 5A below this text. 