Tuesday, October 18th

Last year we studied what scientific notation is. Here it´s the definition and some examples.
And now a TEST.

Adding and subtracting numbers in scientific notation
Watch the explanation.
So, when adding or subtracting in scientific notation, you must express the numbers as the same power of 10. This will often involve changing the decimal place of the coefficient.
For some exercises, try sections G and H on this page. The answers are at the end of that page.

Multiplying and dividing numbers in scientific notation
It´s so much easier. Just multiply or divide the coefficients and the powers of 10. Try the exercises at the end of these pages: multiplication, division.

Tuesday, October 11th

Today it´s about logarithms. We started last week with the definition; let´s remember it with this video.
At this point, you should already know what a common logarithm is or how to work out the value of log 0.001. More info about logs:

Rules of logarithms. Watch this video to learn how to use this rules or properties.

And here you have some examples and exercises.

Tuesday, October 4th

Today it´s about radicals (or surds, as you prefer). To be exact, "rationalising radicals". We are going to first check a presentation and then solve some exercises:

Rationalising radicals

View more presentations from susoigto

Here it´s a link to the video you just watched.

And now some exercises:
1. 4 very simple questions (solve them on your notebook).
2. Answer the questions on this page.
3. And now a game.