Brain Dump

Source: Mathematics For Junior High School I year VII by Marsigit     Chapter I: Integers. Page 25, Number 2 A rocket needs 4 days to go to the moon in which the distance from the earth is 5×〖10〗^5 km. Calculate the distance of the rocket’s journey in 1 day! Answer: It is known that a rocket needs 4 days to reach the moon. The distance of the moon from the earth is five hundred thousand. To calculate the rocket’s journey on a day, the distance of the moon from the earth is divided by the days needed. It becomes five hundred thousand kilometers divided by four days. It is equal to one hundred and twenty five thousand.     Chapter II: Fraction. Page 67, Number 4 70% of students of a junior high school present on the Independent Day celebration. If the total number of students is 40, how many students do not participated in the celebration? Answer: It is known that the number of total students is 40, assumed it as 100%. 70% students do participate in the celebration. It means 30% of stu

Mr. Marsigit gave a great material on last meeting. It was about teaching-learning on school. After giving the material, he asked us to make a reflection about the material and he asked us to add more material from other source. So this is the reflection. In teaching-learning process, there are ten elements. These things are very close to each element. In this time, I will try to write how to do these things in junior high school. The material is plane geometry. 1.        Lesson Plan Lesson plan is made to facilitate teaching-learning process in class. Lesson plan makes teaching-learning activity goes easier and effective. Teacher makes certain about the topic, then make idea that what to discuss in class. Teacher makes activities to do in class. Teacher finds material that needed. If we want to teach about plane geometry for junior high school, we have to find the text book as the basic when we teach. We can ask the students to compare the construction of rectangle and squ

A.       Derivative Notation The derivative of f(x) is written as f'(x). We read it f prime of x. We can say it y' (y prime) because f(x) and y is interchangeable. Other we have notation dy/dx. It means the change in y's over the change in x's or we know it as slope. We say that the derivative is a slope of tangent line at specific point. We remember that the slope is change in y values over the change in x values. For the derivative we need two points. The first is (x, f(x)), f(x) is represented y. We can say that (x, f(x)) is the starting point (x,y). The second point is ((x+h),f(x+h)) with h is change in x. From those points we can find the slope of the line between points by slope formula. The formula is shown bellow. Slope=(change in y's)/(change in x's)=(y2-y1)/(x2-x1) Suppose that y1 is f(x), y2 is f(x+h), x1 is x, and x2 is x+h. So from the formula we get (f(x+h)-f(x))/(x+h-x)= (f(x+h)-f(x))/h h represent change in x values. If we put limit h approach

Reflection for English – Math Videos Last meeting, Mr. Marsigit gave us some videos and told us to make a reflection from the videos. He wanted us to make one reflection that he picked and three others that we picked ourselves. Here're some videos. A.       Basic Mathematics Lesson 4: Properties of Numbers (VideoMathTutor.com) This video is hosted by Luis Anthony Ast. The material is shown bellow. 1.        Introduction All numbers, variables, and algebraic expressions have properties. So in this video, we will discuss about properties of numbers, variables, and algebraic expressions.         Special Note: We use variable A, B, and C to represent numbers, variables, and algebraic expressions. But to simplify we just use the word number or value. 2.        Properties of Numbers a.        The Reflexive Property of Equality A number is equal to itself. A=A, 3=3, 5=5 The reflexive property means that a number is equal to that number itself. So if we have A, we know that A is equal t