Finding the 2/3 of a right angle

Hi, kids. This e-tivity is about angles. By the end

• you will be able to find an angle using as benchmarks the right and straight angles,
• you will learn how to multiply fractions by whole numbers.

Average online time: 15 min

Average offline time time: 10 min

1) DEFINING ANGLES

An angle is the figure formed by two line segments or rays which intersect at a point called vertex. We use degrees (º) to measure the size of an angle.

2) DEFINING OUR BENCHMARKS

For this e-tivity we will use as benchmarks the right angle and the obtuse angle. A right angle has a measure of 90º and a straight angle has a measure of 180º.

3) FINDING THE 2/3 OF A RIGHT ANGLE

METHOD 1

You need to multiply the fraction given by the measure of a right angle.

METHOD 2

2/3 means that I divide the given angle into three parts, and then I take two of them.

ANSWER

The 2/3 of a right angle correspond to 60º.

YOUR TASK

1) Select the angle you will use as benchmark

2) Choose a method

3) Pose a question similar to the one here on this blog entry (you are not allowed to use 1/2)

4) Solve it :)

Post your comment including answers to numerals 1, 2, 3 & 4.

See you around!

Magic Squares

Hi, kids. I have had so much fun creating this e-tivity. I'm sure you'll find it enjoyable as well. This e-tivity is about magic squares, by the end you will be able to

• analyze a situation that involves number sense,
• devise a strategy to fill in a magic square
• explain your strategy to your peers
• recognize that different cultures have brought  ideas, inventions, games to the math field

Average online time: 25 min
Average offline time: 20 min


1- Getting Started
Have you heard about the term brain teaser?
Let's watch this video together. Please, turn on your speakers.

2- Discovering Magic Squares

Analyze carefully the following square.

Do you see any special pattern? (if you need a hint, click here)

Do you have an answer? Compare it with this one.

As you noticed above, a magic square is a rectangular array of numbers so that each column, row and both diagonals have the same sum. In addition, each number appears just one time.

3 - After the origins of Magic Squares

After the origins of Magic Squares on Prezi

Now, it's time for you to seach another game, idea, invention that a culture different from ours had brought to the Math field. Be ready to discuss it in class.

 

4- Let's try one out!

Are you ready for the challenge?

Choose the Magic Square you feel more comfortable with. They have been selected according to the difficulty level they entail.

Easy

Medium

Hard

5- Reporting your findings

• a) Print the puzzle you chose or copy it on your notebook, and bring it next class. Be ready to explain your teacher the strategy you chose to fill in the Magic Square.

See you around!

Doing operations with fractions

Hi, kids. This e-tivity is about adding, multiplying, subtracting and diving fractions.

By the end, you'll be able to

• explain how to add/subtract/multiply/divide fractions.
• use examples to show your understanding of math concepts.

Average online time: 15 min
Average offline time time: 20 min

Create your own video slideshow at animoto.com.


TASK

1) Select one mathematical operation: +, -, x, or /

2) Explain how you will perform that operation using fractions

3) Write down an example to support your explanation

Post your comment including answers to all the above numerals

See you around!

Useful links:

http://www.mathsisfun.com/fractions_addition.html

http://math.com/school/subject1/lessons/S1U4L4GL.html

http://math.com/school/subject1/lessons/S1U4L3GL.html

http://www.mathsisfun.com/fractions_division.html

Visual Thinking

Hi, kids. This e-tivity is about developing your visual thinking. By the end

• you will be able to strengthen your visual intelligence

Average online time: 15 min

VISUAL THINKING

"Thinking is taking in information from the outside world and from within ourselves and processing it with our brain. There are three main ways of thinking that correspond to the senses:

• Hearing – auditory thinking
• Seeing – visual thinking
• Feeling – kinaesthetic thinking.

Visual thinkers think most efficiently, when material is presented to them using diagrams, flowcharts, time lines, films, and demonstrations.

Visual thinkers tend to be spatial and have an eye for size, space and relationships.

To retain information they often draw it as a diagram." (Sword, 2005)

Learners should develop all three types of thinking in order to enhance their learning process.

BIBLIOGRAPHY

Sword, Lesley (2005). The Power of Visual Thinking. Retrieved on February 6, 2010 from http://giftedservices.com.au/visualthinking.html

TASK

1) Choose two out of the three shapes shown below.

2) Count the number of cubes in each shape.

Post your comment answering numerals 1 & 2. See you around!