Archive for October, 2012

VAT

Posted by ricardogm on 30th October 2012

Hi

This is a simple explanation about VAT  calculating.

Here you can learn how to calculate the net amount (price without VAT)

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Percentages

Posted by ricardogm on 28th October 2012

Hi

Today we are going to work with percentages. It’s an easy and useful part of maths but, surprinsingly, there are many people that don’t use them well. Even people that need to calculate percentages in their work (sales, for example) have problems sometimes with them. Why? I don’t know. It’s a mistery for me. Well let’s start…

0. First of all, some instructions: I’m going to check your productivity in this room, in this way: you are going to write everything in a word documen, as usual, but you are going to send me this document several times at different moments:

The first time, at 9:30. Send your work at that moment and keep working

The second time, at 9:45. Keep working

The last time, at the end of the class

So, at the end of the class, I’m going to have three versions of your documents, each one bigger thant the previous one.

2. Now solve parts 11 and 12 of this unit of the Anaya workbook.

3. Try out this test about percentages.

4. Solve these problems: (Clue: VAT = IVA)

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Proportion

Posted by ricardogm on 21st October 2012

Howdy

1. First of all, send me an email with an estimation of the marks you think have got in the last exam. Round it to the tenths, please

2. Now, go to the campus and read chapter 3 (Proportionality).

3. Try to solve some problems of direct and inverse proportion. Go to pages 6 and 7. Translate the theory in the rectangle and try to solve as many problems as you can. Send me your work as usual.

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Some problems…

Posted by ricardogm on 14th October 2012

Hi

Today we are going to solve some problems of your book, in a word document as usual. I want you to translate the problems into english. At least one of the problems is going to show up in the exam, so try to do your best. The problems are these:

• Page 22, ex. 114 and 115
• Page 23, ex. 116
• Page 38, ex. 100 to 103
• Page 39, ex. 104

(Note: if you use google translator or something similar, be careful)

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Real numbers

Posted by ricardogm on 7th October 2012

Hi

1. Read this interesting chapter of the book “The man who counted” (themanwhocount3.pdf) and try to answer these questions:

a) In a word document, write the fractions and operations that appear in the story.

b) Can you find out why the division of Beremiz worked? Explain it to me.

2. Work out these exercises (page 3 of this book): If you can, copy and paste in a word document. If not, find another way to write the exercises and solve them.

3. Go to this page and do parts 4, 5 and 6

4. Go to the campus, read chapter 2b, and then try to solve these problems. Send the answers to me:

Scientific notation word problems    Name__________________Date_______Bl.__

1.     The particle of dust has a mass of 7.53 x 10-10 kilograms.  Find the weight of 5 billion dust particles.

2.     2.  The distance from the sun to the Andromeda galaxy is 1.2 x 1019 miles.  Light travels at a speed of 5.88 x 1012 miles per year (called a light-year).  How long does it take light to travel from the sun to the Andromeda galaxy?

3.     3.  The mass of the sun is 1.989×1030 kilograms.  The mass of the earth is 5.98×1024 kilograms.  How many times bigger is the sun than the earth?

4.     4.  Total health care costs in the United States in 2003 was \$1.7 trillion.  The U.S. population was 290.9 million.  What was the average amount spent per person on health care?

5.  The population of Mathville is 5.6×103.  The population of Algeville is 1.3×104.

How many more people are there in Algeville?

6.  There are 3.4×109 particles of dust per cubic meter. How many particles

are there in a room that is 1200 cubic meters?

7.  There are 1 million bacteria in an infected wound that is 0.4 square cm.

How many bacteria are there per square cm?

8.  Remember, distance = rate x time (d = rt)

A rocket travels at a speed of 5 thousand mph. for 30 thousand hours.  How far does it

travel?

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