# number line

## The Difference of Two Squares Formula - A New Look

The difference-of-two-squares formula a2 − b2 = (a − b)(a + b) is so basic that it would seem a difficult task to say anything new about it! But Agnipratim Nag of Frank Anthony Public School, Bangalore (Class 8) has done just this. In this short note we describe his interesting and innovative approach to prove the identity. It has particular relevance for those who teach at the middle school level.

## Best of 2015 Classroom Ideas

Here is a quick rewind of some interesting ideas that got featured on the Teachers of India website. We know it is not final. We know there are very many resources you found it useful that we couldn't feature in this particular list. How about you making your own list and sending it to us. We also invite you to remix ideas from your own experience and share it with larger teacher community. That would be a great bang to start the year!

## Solving Complex Equations on a Ganit mala

You can also solve more complicated equations on a double ganit mala and open number line. This demo includes equations with multiple operations but with "x" appearing only once.

## Solving Simple Equations on a Ganit mala

You can not only learn about basic math operations involving whole numbers and integers, but can also solve equations on a double ganit mala and open number line. This presentation demonstrates the concept of solving simple equations i.e. equations involving only one operation.

## Solving Equations on a Ganit mala

Here is a short demo on "x" and its neighbourhood on the double ganit mala and open number line.

## Comparing integers with a Ganit mala

How about using a colourful double ganit mala to help your students understand integers better? And an open number line that can be easily drawn? Visualizations can help students with comparing numbers and understanding why one number is less than or greater than another.

## Subtraction with a Ganit mala

A double ganit mala and an open number line can be used to explain the concept of subtraction of integers to students. Swati shows you how.

## Addition with a Ganit mala

Swati shows you how a double ganit mala and an open number line can be used to explain the addition of integers to students. A 'double Ganit mala' is a string with sets of 4 different coloured beads that is used to model the number line.

## Integers with a double Ganit mala

A 'double Ganit mala' is a string with sets of 4 different coloured beads that is used to model the number line. 2 colours are used for the positive part while the remaining 2 colours are used for the negative part. Swati shows you how to use a double ganit mala to introduce your students to the topic of integers.

## More on Subtraction

Here is another video from Khan Academy on subtraction.

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