# MHSB - 7 - Maths :: Direct and Inverse Proportion

## Course Content / Subtopic list:

1. Equations In One Variable
2. Inverse Proportion
3. Partnership

## Lesson Plan

[Contributor - Kripa S]

Objective: To introduce direct and inverse proportion

Subtopics to be covered:

- General formula for direct proportion

- Gneral formula for inverse proportion

- Word problem to find value in direct or inverse proportion

Learning Outcome:

- Students can identify whether given data is in direct or inverse proportion

- Students can solve a problem on proportion to find unknown value

- Students can frame proportion on a word problem

## Videos

[Contributor - Kripa S]

## Images

[Contributor - Kripa S]

http://www.edpax.com/media/managed/large/ratio_proportion_2nd_41.png (direct proportion example 1)

http://www.rpdp.net/mathdictionary/english/vmd/images/e/equivalentratios.gif (direct proportion example 2)

https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcTHyX4m1veFeiPuZymoJGrmR8_G1Hi8qZKBzfUE66geuwYD0ry0 (direct proportion example 3)

https://doubleconformal.files.wordpress.com/2014/11/inversionbubblec2.png (inverse proportion example 1)

## Activities

[Contributor - Kripa S]

1. One pen costs 5 rs. How much with 10 pens cost? Is this direct proportion or inverse proportion? Why?

2. In 1 day, my sister reads 20 pages of a book. In how many days can she finish a book of 200 pages? If my sister reads 25 pages in a day, in how many days can she finish the book? Is this direct proportion or inverse proportion? Why?

[Contributors - Sushant Raut, Niranjan Kadam]

## Transliteration

 Term Transliterated Term Translated Term direct proportion डायरेक्ट प्रोपोरशन समप्रमाण inverse proportion इन्व्हर्स प्रोपोरशन व्यस्तप्रमाण increases इनक्रेसेंस वाढतात decrease डिक्रीस कमी proportion प्रोपोरशन प्रमाण partnership पार्टनरशिप भागीदारी capital कॅपिटल भांडवल investment इन्व्हेस्टमेंट गुंतवणूक profit प्रॉफिट नफा loss लॉस तोटा business enterprise बिझिनेस एंटरप्राईस व्यवसाय ratio रेशिओ गुणोत्तराच्या

## Worksheets

[Contributors - Sushant Raut, Niranjan Kadam]

Worksheets [Version 2021]