Categoría: 2ºESO Maths

Hi, today we start as usual, but only with this one:

1. https://chemarias.com/cm/tabla/index.html. Three attempts and one screenshot.

 

Today we start a new unit, proporcionality, in which the most important concepts are ratios and proportions. Here you have an article about them:

Ratio and Proportion in Math

But we are going to use this clasroom to learn a bit about that with the help of  Javier Cayetano:

• 2. Razón y proporción. Jugamos con los conceptos básicos – GeoGebra

Next one, the rule of three. First an explanation:

Rule of Three is a Mathematical Rule that allows you to solve problems based on proportions

And now, some exercises:

• 3. Proporcionalidad directa. Regla de Tres – GeoGebra

Percentages are an special case of proporcionality, quite common. Some exercises:

• 4. Calcula el porcentaje… – GeoGebra
• 5. ¿Cuánto es ese porcentaje? – GeoGebra

 

 

 

Mr. Al-Geebrah’s Fractions Math Story – Mr. R.’s World of Math

And more things:

Junior Kangaroo

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Hi, today we start as usual, I’ve seen some progress…

 

1. https://chemarias.com/cm/tabla/index.html. Three attempts and one screenshot.

2. https://mathster.com/10secondsmaths/ . Use the operations + – * /. Five minutes and one screenshot.

And then, the moment you were waiting for (J. Cayetano). 6 or 7 minutes each and don’t forget to send me screenshots.

3. One page to review the conversion thing:

https://www.geogebra.org/m/AsMKtWd4#material/UTEUv6zD

4. Finding how much is a part of a number:

https://www.geogebra.org/m/AsMKtWd4#material/DQYgb3g7

5. Finding the fraction:

https://www.geogebra.org/m/AsMKtWd4#material/h5vUPP28

6. And lastly, finding the total:

https://www.geogebra.org/m/AsMKtWd4#material/mK6jHHby

 

Bonus video:

 

 

 

 

And the story of Hippasus

 

 

Hi, as usual, mental calculations to warm up. Try to improve over the previous sessions:

1. https://chemarias.com/cm/tabla/index.html. Three attempts and one screenshot.

2. https://mathster.com/10secondsmaths/ . Use all the operations. Five minutes and one screenshot.

 

2. Some worksheets to solve, you can do the calculations in your notebook, and answer the question in the worksheet. Take a screenshot of your results:

a) https://www.liveworksheets.com/worksheet/en/math/2204003

b)https://www.liveworksheets.com/worksheet/en/math/2243372

c)https://www.liveworksheets.com/worksheet/en/math/684721

3. Another collection of word problems

Google doodle from Oct. 22, 2025.

 

 

Hi, today, as usual, we start with mental calculations. try to improve over the previous session:

1. https://chemarias.com/cm/tabla/index.html. Ten minutes and one screenshot.

2. Now we are going to use some applets from Javier Cayetano:

Mental calculations with fractions:

1. https://www.geogebra.org/m/AsMKtWd4#material/spxtxfjb
2. https://www.geogebra.org/m/AsMKtWd4#material/bfgmuzy9

3. At last, calculations in your notebook (remember to simplify):

https://www.geogebra.org/m/AsMKtWd4#material/ZpJbaxeD

And some Geogebra resources:

https://www.geogebra.org/math/fraction-operations

 

 

 

 

1. Mental calculations:

a)Mental Math: first 5 minutes of the class, send me a screenshot.

b) https://chemarias.com/cm/tabla/index.html. Five minutes more and another screenshot.

2. Practice converting fractions into decimal numbers. It’s easy. Paste the exercises in a word document and write the answers there. This is the document (2 pages):

decimals-comp-packet (arrastrado)

3. Now some problems, that you must paste and solve in the same document, writing all the operations (2 pages as well):

decimals-comp-packet (arrastrado) 2

4. Don’t forget to send me the word document at the end of the class.

Bonus videos:

 

 

 

Howdy

We are starting today with decimal numbers (Unit 1.1), but first of all some mental math:

1. New web to try: Mental Math : first 10 minutes of the class, send me a screenshot.

 

2. We are using Geogebra to explore the infinity, pay attention. Send me a screenshot.

3. This is a calculator with great precision.

4. Open this pdf and create a word document solving the exercises in these pages of the pdf. At the end of the class, send the document to me.

• Page 8 (the one after page 7)
• Page 9
• Page 11
• Page 13
• Page 14

 

Is it practice, or practise?

Well, let’s practise:

1. Mental calculations: first 10 minutes of the class, send me a screenshot of your best effort:
   1. https://mathster.com/10secondsmaths/
   2. https://chemarias.com/cm/tabla/index.html
2. Using the colection of geogebras of Javier Cayetano, they are useful to prepare exams, send a screenshot of each category:
   1. Cuatro números enteros.
   2. Powers
   3. Problems
3. Some Liveworksheets, useful as well, send screenshot when finished:
   1. Powers and roots
   2. Powers
   3. More problems

I forgot to tell you how I’m going to figure out the mark for your notebooks, with this rubric:

Hi

A couple of videos: