APSB - 8 - Maths :: Direct and Inverse proportions
Go To: APSB-Mathematics-Grade 8
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[Author - 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
[Author - Kripa S]
http://scert.telangana.gov.in/sites/default/files/publication/ebooks/8TM_MAT.pdf#page=243 (Telangana Board) (Telugu Medium)
https://drive.google.com/folderview?id=0B0WiysvR2DOlZFo2MFc4RzBweWc&usp=sharing (AP Board) (Telugu Medium)
http://scert.telangana.gov.in/sites/default/files/publication/ebooks/8EM_MAT.pdf#page=243 (Telangana Board) (English Medium)
http://apscert.gov.in/ebookapp/GeneratePdf (AP Board) (English Medium)
[Author - Kripa S]
http://fathom.lib.uchicago.edu/2/21701757/21701757_geoscaling.jpg (direct proportion example 1)
https://aos.iacpublishinglabs.com/question/aq/1400px-788px/direct-square-proportion_8559b56553d9c2bf.jpg?domain=cx.aos.ask.com (direct proportion example 2)
https://www.mathsisfun.com/algebra/images/proportion-inverse-square.svg (inverse proportion example 1)
http://studyn.us/blog/wp-content/uploads/2010/09/CartoonSeeSaw.gif (inverse proportion example 2)
[Author - 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?
[Contributor - Sirish Kumari]
https://drive.google.com/open?id=1UPV4CKkT_nR5fvou-36d9x0BGwMh_Odl (Answer Key 1)
https://drive.google.com/open?id=1itdGoXbWmyl0xX3sLrvS42iAi_Nps_BH (Answer Key 2)
[Contributor - Sirish Kumari]
https://drive.google.com/open?id=1eeYU2kFu2mTAoZTp7BerhyK3qTBK77Qm (Worksheet 2)
https://drive.google.com/open?id=1HJ_sgipsFmUWQN2X0GZfRrhcSqIPGS67 (Worksheet 2)
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