# Classroom Resources

## Problems for the MIDDLE SCHOOL Problems Related to Divisibility

Factors and multiples, tables and long division – students who are relieved at mastering these in numbers are confounded when the same topics rear their head in algebra. Here is a nice collection of problems that allow students to play with algebraic expressions and study them through the lens of divisibility.

## Mobile Puzzles – Making Sense of Variables and Equations

For the middle school student, the transition from arithmetic to algebra is often quite daunting. In grade VI, the concept of a ‘variable’ is encountered for the first time. This is the stage where either a child embraces the newly introduced ‘Algebra’ or gets overwhelmed with the idea of numbers being replaced by letters of the alphabet. This is also the stage where the students learn to solve equations and find the value(s) of the unknown(s).

## Make a musical instrument from a broken ballon - Yes it sounds like a bagpipe

Press fit a long plastic pen tube in a bottle lid. Press a hard straw on the rim for blowing. Stretch a torn balloon on the lid to make a taut membrane. Push the pen from below to touch the membrane. Now on blowing through the straw you will hear loud sound. The vibrating membrane will produce the sound.

For pictorial view of the steps to make this toy, click on this link: http://www.arvindguptatoys.com/toys/Loudlid.html

## Fun with Dot Sheets - 2

In this article, we focus on investigations with graph paper. Pages 45 & 46 give guidelines for the facilitator, pages 43 & 44 are a worksheet for students. This time we explore quadrilaterals and triangles using lattice points.

## A Note on Armstrong Numbers

In this article, student Satvik Kaushik investigates Armstrong numbers. Mathematical investigation is a powerful way for students to learn more about concepts that interest them. In mathematical investigations, students are expected to pose their own problems after initial exploration of the mathematical situation.

## Arc - centre Theorem

In this short note, we discuss a theorem (arc-centre theorem) which states that an arc can have only one centre of curvature.

## Shapes with Sutli: The String Game

This article describes an activity where students created different geometrical shapes using a closed-loop string and developed conceptual understanding by engaging with properties of the shapes. The activity encouraged them to think deeply about the meaning of points, straight lines, edges, faces, and angles of geometrical shapes. Using standard models which are generally available, students only get to view geometrical shapes or build them by following a set of instructions.

## Structure of the Atom

This interactive Lesson Plan will help you understand the structure of atom. The in built questions and answers are really interesting and challenges the student to think and strengthen his/her conpects around this topic.

## Biodiversity and Life

Topics like Biodiversity and ecosystem are a part of syllabus that has been prepared for environmental science by NCERT for 9th and 10th std students. That can be taught with the help of this module.

## Understanding Computer Programming

Through these two Lesson Plans children will understand meaning of instruction in real life, which will help them to get a sense of Computer Programming.

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