PREPARING THE POPULATION PYRAMIDS EXAM

Hello everybody!

Are you studying for the exam on population pyramids? Here you have an exact model of the exam on Wednesday. If you want, you can practice, answer the interpretation questions and send them to me in a comment to correct them, ok?

Hola a todos! Estáis estudiando para el examen de pirámides de población? Aquí tenéis un modelo exacto de cómo será el examen del miércoles. Si queréis, podéis practicar, contestar a las preguntas de la interpretación y mandármelas en un comentario para que os las corrija, vale?

Examination model

Anyway, remember the website where you can find the population pyramids of every country in the world. As a training for the exam, see as much as possible and try to guess the type.

De todas formas, recordad la página donde podéis encontrar las pirámides de población de cualquier país del mundo. Ved tantas como podáis y tratad de averiguar el tipo al que pertenecen, como entrenamiento para el examen.

Population pyramids website

PREPARING THE EXAM

As I promised, in order to prepare your exam on population, you can have a look at the next file. There you can find the contents that you have to study for next Thursday.

Preparing the exam

Study hard and good luck!

Pilar

Sieve of Eratosthenes

The Sieve of Eratosthenes is an ancient method for finding all primes numbers up to a specified number.

It was created by Eratosthenes (275-194 B.C., Greece), an ancient Greek mathematician. Just as a sieve is a strainer for draining spaghetti, Eratosthenes's sieve drains out composite numbers and leaves prime numbers behind. The numbers from 1 to 100 are listed in a table. We will use The Sieve of Eratosthenes to find all primes up to the number 100 by following the directions below.

Directions:

1. Cross out 1 since it is not prime.
2. Circle 2 because it is the smallest prime number. Cross out every multiple of 2.
3. Circle the next open number, 3. Now cross out every multiple of 3.
4. Circle the next open number, 5. Now cross out every multiple of 5.
5. Circle the next open number, 7. Now cross out every multiple of 7.
6. Continue this process until all numbers in the table have been circled or crossed out.

You have just circled all the prime numbers from 1 to 100!
Download presentation

Questions (to be answered as a comment):

1. How many prime numbers are there from 1 to 100?
2. List all prime numbers from 1 to 100.
3. Which number is the only even prime number?
4. An emirp (prime spelled backwards) is a prime that gives you a different prime when its digits are reversed. For example, 13 and 31 are emirps. List all emirps between 1 and 100.

Enjoy it!
ALICIA

Nets

Hi girls and boys,

Here you have a link where you can find the 3D models (also called "nets") for every 3D shape.

See website

If you want to practice associating nets and figures, go to the following site:

Practice

ALICIA

Surface area and Volume, part I

Hi all,

these days we have been working in class with surface area and volume of some geometric shapes. I leave you here some links to go over the most important ones:

Platonic solids (tetrahedron, cube, octahedron, dodecahedron, icosahedron)

Pyramids

Prisms

Cylinder, cones, sphere

Remember that you have to present by the end of this week your work including:

1. Description of your shape

2. Net

3. Surface area and volume

4. Examples in real life

5. Problem

(Deadline: friday, 11th of november)

If you want to practice or get some ideas or pictures, you can find more exercises here:

Surface area of a cube, rectangular prism, pyramids and cones, cylinder, cylinder and prism,

Volume of a cube, rectangular prism, prism and cylinder, triangular prism, cone, pyramid and cone, cylinder, pyramid, sphere

Volume and surface area of sphere

Take care,

ALICIA

Present simple or present continuous?

If you want to know when you should use the present simple or the present continuous, click here. You also have a web to practise if you need.

Your Halloween cakes

Thank you very much for all the scary (and tasty) cakes you did.

Here you can see some sweet spiders, a terrific graveyard, some tasty pumpkins, a special skull, some funny bats and a cobweb... but there were more wonderful cakes. You have made an excellent work.