Langsung ke konten utama

English Assignment for Writing Test

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 students do not participate in the celebration. The number of students do not participate in the celebration is 30% from 40 students; it is equal to 12 students.

    Chapter III: Algebra and Application. Page 129, Number 5
A rice trader buys 40 kg rice for Rp90, 000.00. Then he sells back for Rp2, 700.00 each kilogram. Determine the percentage of his profit.
Answer:
It is known that the price of 40 kilograms is Rp90, 000.00. So the price for each kilogram is Rp90, 000.00 divided by 40 kilograms, it is equal to Rp2, 250.00. The trader sells Rp2, 700.00 each kilogram. The profit is Rp450. 00 for each kilogram. His total profit is Rp450. 00 time 40 kilograms; it is equal to Rp18, 000. 00. The percentage of the profit is from the total profit divided by the buy price then time 100%. It becomes Rp18, 000.00 divided by Rp90, 000.00 then time 100%; it is equal to 20%.

    Chapter IV: Linear Equation with One Variable. Page 151, Number 5.
Amir is 6 years older than Anwar. Three years ago, Amir’s age is twice as Anwar’s age. How old are they now?
Answer:
Amir is 6 years older that Anwar. From that state, we can form the equation that x is equal to y plus 6.
Three years ago, Amir’s age is twice as Anwar’s. From that state, we can form the equation that x minus 3 is equal to 2 times y and minus 6. We can substitute the first state into the second state. The equation becomes y plus 3 is equal to 2 times y and minus 6.  Subtract each side with y, it is become 3 equals to y minus 6. Add each side with 6, it is become 9 equals to y. We can form that y is equal to 9. Then substitute y equals to 9 into the first equation. It is become x equals to 9 plus 6, it is 15. So Amir’s age is 15 and Anwar’s age is 9.
Label:

Komentar

Posting Komentar

Postingan populer dari blog ini

Komentar dari Post : Problematika Pembelajaran Matematika di SD

Nawangwulan Vennia Hanung Hershanasti Pendidikan Matematika Internasional 2011 11313244016 Assalamualaikum w.w. Saya adalah salah satu siswa yang mengalami pembelajaran matematika yang amat sangat menyenangkan di sekolah dasar. Dari apa yang saya alami, cara mengajar guru atau cara guru menyampaikan materi mungkin sama dengan apa yang saya pelajari selama ini, menggunkan lembar kerja, ada diskusi antar siswa, bahkan dibentuk kerja kelompok dimana memungkinkan siswa yang 'lebih unggul' dapat mementori kawan dalam satu kelompoknya, sehingga dalam pembelajaran matematika tidak hanya melulu belajar matematika saja, tapi juga memberikan pelajaran lain, yaitu pelajaran kehidupan di mana adanya bahu membahu dan membantu dalam menyelesaikan suatu problema, terutama berlajar bertanggung jawab atas apa yang dibebankan kepada siswa secara kelompok (berupa soal-soal). Jadi pembelajaran matematika juga membangun kepribadian siswa. Prestasi belajar matematika di sekolah dasar mu...
Posting Komentar
Baca selengkapnya

English Assignment - Reflection from Videos (part 2)

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...
Posting Komentar
Baca selengkapnya

English Assignment

1.        1. Father has Rp1, 200,000.00 as his salary and reduces 14% tax. Determine father's salary after imposed by tax. (Book 1, page 129) 2.        2. If the price of one dozen of spoons is Rp18, 000.00, how much it cost for 27 spoons? (Book 1, page 187) 3.        3. The perimeter of a garden is 30 meters. The ration between the length and the width of the garden is 3:2. Determine the length and the width of the garden! (Book 1, page 189) 4.        4. Solve the following equation: 9x+4=3x+22 (Book 1, page 145) 5.        5. A tradesman has bought rice from farmer in Rp4, 500.00 for each kilogram. Then he sold it in Rp4, 700.00 for each kilogram. Determine the tradesman's profit if he can sale 90 kilograms of rice! (Book 1, page 123) 1.        1. Father's salary is Rp1, 200,000.00. Assume that his salary is...
Posting Komentar
Baca selengkapnya