# Class 6-8

## CHALLENGING PRIOR MENTAL MODELS OF LEARNING

VISHNUTEERTH AGNIHOTRI & ANAGH PURANDARE

## Area of triangles and quadrilaterals

Exploring areas of rectangles, triangles, parallelograms and trapeziums including some ignored aspects. Models can be made using stiff paper/card/boxes.

## Division with multi-digit divisors

Multi-digit divisors are neglected in some syllabi and textbooks including the NCERT ones. They pose a lot of challenges and provide the only case when a standard algorithm of any of the four operations requires estimation. While the skill of dividing with such divisors may have lost its relevance thanks to the prevalence of mobiles with calculators, it is debatable whether they should be completely removed from school math. This ppt explores how to tackle such divisors and includes all possible estimation scenarios.

## Division Using Array

Division can be explored using array. This further establishes the reverse process of multiplication. It also brings out dividend = divisor x quotient + remainder beautifully. Check the ppt for all these and more...

## Seeing the Invisible: Imaging a Black Hole

In early April this year, newspapers and online websites were agog with the news that astronomers had obtained the first image of a black hole known to reside in a distant galaxy called M87. Why did this image cause such a stir?

Fig. 1. The image of a ‘black hole’ at the heart of galaxy M87.

## What Do We Really See?

This article presents a few simple activities, with handmade toys and optical illusions, that explore ways in which our brain and eyes work together to perceive the world.

## A Milky Way to Learn Biology

The simple and everyday practice of curd formation involves concepts taught in biology (microbial fermentation), chemistry (conversion of milk lactose to lactic acid) and physics (coagulation of milk proteins with acid). Can we use this process to offer a hands-on introduction to what it means to think like a scientist?

Deepti Trivedi

SHREYA GHOSH

JOYSHREE CHANAM

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