Posted in Algebra, Math videos

Teaching mathematics by visual scaffolding

Visual scaffolding is a natural support to learning mathematics since most mathematical concepts are first distilled visually i.e. a concept is conceived as having a specific visual beginning, and a defined visual progression. As the concept progresses, numbers are incrementally engaged in translating the visuals into numerical information. The visual connections are designed to make mathematical connections explicit since leaving them implicit is what makes Mathematics appear so “difficult”. When this is done  via dynamic imagery (animation), numerical reasoning is evoked quite easily.

It doesn’t take long before learners grasp the thinking that is going on behind the mathematical operations. It is this thinking that learners start to assimilate. Before long, they develop a mindset, a way of thinking that is mathematical: i.e. cognitively organized, intuitively analytical, meaningful and  purposeful.  They start to think of, and arrange numerical information  in intelligent  patterns, and their personal heuristics start to develop a trajectory in the direction of formal algorithms.

Visual scaffolding approach is drawn from the fundamentals of basic learning theories. Everything we learn is first received by the sensory apparatus (see, hear, touch, etc) before getting converted into “digitized neuro-bytes” of abstract information for deeper and more extended understanding and application.

In Karismath’s, most lessons and exercises have different levels of visual scaffolding. For teaching algebraic expressions for example,

In Part 1 no numbers are used.  Learners use “green peas and red tubes” to engage in trial-and-error approaches to  solve a problem. The concept of an equation is communicated non-numerically.

In Part 2, learners are introduced to a “smarter” way to approach the same problems. Their prior knowledge of equality is all that is needed. The design of the templates (peas and tubes, and their placement) evokes their  “cognitive consensus”  over a simple piece of reasoning: that the removal of the same quantities from the left and right  side of the equation will maintain the numerical balance on both sides. This fact leads to the discovery of a strategy that helps them solve the equation correctly each time, without any trial and error.

In Part 3, the visual processes are simply translated as recordings of what was done visually. That’s all. The numerical representations become formal mathematical garments of processes that were initially common-sensical, processes that were visual and even possible to perform physically.

Karismath displays the power of mathematical thinking in this transition from the concrete and the visual to higher levels of abstraction . Once learners understand this power, it is not difficult for them to get addicted to it.

Those who understand Mathematics this way, from within its inner core of brilliant reasoning, can often get addicted to its power of abstraction.

Which is what Karismath is trying to achieve. Please check out the Karismath Insights video Clips on You Tube in the Karismath Channel link below: http://www.youtube.com/karismath

You can also see the same lessons, with their index, by clicking on the following link:

http://www.dyscalculia.org/experts/karismath/see-lessons

Many more Karismath Lessons will be uploaded almost weekly, all through this year and the next.

Shad Moarif
Founder-Developer
Karismath

 

About Shad:

Shad, a Harvard graduate, has a background in Science, Psychology, Reading and Mathematics. He has also developed a comprehensive theoretical perspective of his Five Stages of Math Achievement that awaits publication. 

His work has been influenced by his 35 years of teaching Mathematics and Language to children (and adults) with Mathematics and Language-learning difficulties in Asia, Canada, US and the UK. He has conducted numerous teacher-training seminars and workshops at conferences  in the US, Canada, UK, Singapore, Bangladesh, Pakistan and Kenya.

 In 2010 he was the Keynote speaker in  two major conferences (Canada and the US).  Shad was Vice-President, International Dyslexia Association (British Columbia), and also served as a member on IDA (BC)’s Advisory Board, and also on The Aga Khan Academy (Mombasa’s) Steering Committee for Mathematics Teacher Education. 

 

 

Posted in Algebra

Visual representations of the difference of two squares

Students’ understanding of mathematics is a function of the quality and quantity of the connections of a concept with other concepts. As I always say in this blog, ‘To understand is to make connections’.

There are many ways  of helping students make connections. One of these is through activities involving multiple representations. Here is a lesson you can use for teaching the difference of two squares, x^2-y^2.

Activity: Ask the class to cut off a square from the corner of a square piece of paper. If this is given in the elementary grades, you can use papers with grid. If you give it to Grade 7 or 8 students you can use x for the side of the big square and y for the side of the smaller square. Challenge the class to find different ways of calculating the area of the remaining piece. Below are two possible solutions

Solution 1 – Dissect into two rectangles

 

Solution 2 – Dissect into two congruent trapezoids to form a rectangle

 

Extend the problem by giving them a square paper with a square hole in the middle and ask them to represent the area of the remaining piece, in symbols and geometrically.

Solution 1 – Dissect into four congruent trapezoids to form a parallelogram

 

Solution 2 – Dissect into 4 congruent rectangles to form a bigger rectangle

These two problems about the difference of two squares will not only help students connect algebra and geometry concepts. It also develop their visualization skills.

This is a problem solving activity. It’s important to give your students time to think. Simply using this to illustrate the factors of the difference of two squares will be depriving students to engage in thinking. They may find it a little difficult to represent the dimensions of the shapes but I’m sure they can dissect the shapes. Trust me.

Posted in Algebra

Top Ten Reasons To Become A Teacher

1.  Work with Children and Young Adults – Children are a joy to work with. You will laugh almost every day at silly jokes that you come up with as you teach or the funny statements they can make. Children’s energy, imaginations, and fresh insight will be certain to keep you forever young.

2. Lifelong Learning – If you love learning, teaching is a career that uses that passion. You will become an expert in your subject area(s) because there’s no better way to learn a subject than to teach it. Students will ask you interesting questions that you haven’t thought about before, challenging you to learn even more to stay ahead of them.

3. Variety – While most people have jobs that require them to do the same thing every day, teaching offers a lot of variety. You will work with a completely different group of students each year. As you gain experience, you may decide to adopt new teaching methods or to teach a new topic. Best of all you will learn new things from your students every day, not to mention a great deal about yourself.

4. Health Benefits – Many teachers get great health and pension plans. In fact, teachers’ health, vision, and dental benefits are often among the best compared to other industries.

5. Reasonable Hours – Since teachers work on school hours, it’s a great job for anyone with kids. You’ll have more time with them before and after school, which means that you don’t have to worry about childcare or missing their next soccer game.

6. Interpersonal Interaction – Forget sitting in a cubicle all day. Teachers get to interact with students, parents, and other educators on a daily basis. You’ll also have many opportunities to get involved in the community through field trips, after-school activities, and service projects.

7. Job Security – Teachers are always needed. Once you’ve established yourself, you should always be able to find a job. Downsizing and layoffs don’t happen nearly as often in schools as they do in other industries. And contrary to popular belief, teacher salaries aren’t as low as you think, and they can increase significantly over time.

8. Autonomy – Even if you have to teach a specific curriculum, you get to decide what happens in the classroom each day. Every teacher teaches differently based on his/her personality, creativity, knowledge, and beliefs.

9. Vacation Time – You’ll have not only two weeks of vacation for the holidays, but several other breaks throughout the year for public holidays, mid-term breaks, and of course, summer! Even if you teach at a year-round-school, plenty of vacation time will be scheduled throughout the year. This is a great time to travel the world, pursue a hobby, further your education, or even have a seasonal career at a summer camp or national park.

10. Make a Difference – Teachers impact students’ lives in profound ways. Just think back to some of your favorite teachers and how much they meant to you. Teachers can help students discover their passions and develop skills to reach their full potential. You will even get to see the difference you make every day in the classroom as students get excited about learning and improve throughout the year.

This article is by Andrea Erins. Andrea has been teaching  13 years and enjoys writing about a variety of topics related to education. She is the owner of the site Masters in Education.

Readers are invited to submit articles to this site. Click here for details about guest posts.

Posted in Algebra

A challenging complex number problem with solution

This complex number problem was selected on the basis of its uniqueness in terms of phrasing things within the Argand diagram/locus context. While my proposed solutions might be short, bear in mind this question truly demands/challenges the student to think unconventionally in order to formulate a viable solving approach.

 

Problem

A complex number z=x+iy is represented by the point P in an Argand diagram. If the complex number w where w = \frac{z-8i}{z+6}, (z\neq-6) has its real part zero, show that the locus of P in the Argand diagram is a circle and find the radius and the coordinates of the centre of this circle. If, however, w is real, find the locus of P in this case.

Solution

complex number problem

The author of this post is Mr. Frederick Koh. He is a teacher residing in Singapore who specialises in teaching the A level maths curriculum. He has accumulated more than a decade of tutoring experience and loves to share his passion for mathematics on his personal site www.whitegroupmaths.com.

If you love this problem, I’m sure you will also enjoy the two other challenging problems shared by Mr. Koh in this site:

  1. Differentiation in parametric context
  2. Working with summation problems