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Mathematics

Singapore Textbooks
Textbooks published in Singapore, and listed in the Approved Textbook List of the Singapore Ministry of Education (https://atl.moe.gov.sg/). There main publishers here are Shinglee and Marshal Cavendish.

Panpac Additional Mathematics
OpenlySolved Introduction Panpac Additional Mathematics (by Ho Soo Thong and Khor Nyak Hiong)
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Panpac Additional Mathematics (Workbook)
By Chua Teck Lee, James Fensom and Terry Xiao (2010)
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 12
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Latest: Solutions yeom keonung, Apr 5, 2013 
Shinglee Additional Mathematics (8th Edition)
OpenlySolved Introduction Shinglee Additional Mathematics
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 24
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Shinglee Additional Mathematics (Workbook)
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 10
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Discovering Additional Mathematics
OpenlySolved Introduction Discovering Additional Mathematics
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 17
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Discovering Additional Mathematics (Workbook)
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 12
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Discovering Mathematics 3A
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 10
Latest: Try It  Chapter 1 Salma Hossain, Nov 10, 2016 
Discovering Mathematics 3B
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Discovering Mathematics 4A
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Discovering Mathematics 4B
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 11
Latest: Exercise 5.3 Ramie4477, Apr 21, 2015 
Additional Maths 360
By Ho Soo Thong, David Khow Nyak Hiong and Yan Kow Cheong (2013) Published by Marshall Cavendish ISBN 9789810117481
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Latest: Exercise 22 Sophia_Joanne, Mar 19, 2016 
Shinglee Mathematics 1 (6th Edition)
By Teh Keng Seng, and Loh Cheng Yee (2007)  am working on the solutions for this book right at this moment  expect additions in the next few days ...
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 24
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 132

Shinglee Mathematics 2 (6th Edition)
By Teh Keng Seng, Loh Cheng Yee, Joseph Yeo, and Ivy Chow (2008)
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 11
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 87

Latest: Exercise 2D ascklee, Mar 18, 2014

Shinglee Mathematics 3 (6th Edition)
By Teh Keng Seng, and Loh Cheng Yee (2007)
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 11
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 35

Shinglee Mathematics 4 (6th Edition)
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Latest: Chapter 3 (Rational Numbers)... Salma Hossain, Nov 7, 2016



Target Additional Mathematics (Sasbadi)
OpenlySolved Introduction Target Additional Mathematics
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Longman PreU Text STPM Mathematics S&T (Paper 1)
OpenlySolved Introduction Longman PreU Text STPM Mathematics S&T (Paper 1)
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Latest: Solutions to Exercise 2.1 ascklee, Feb 3, 2012 
Longman PreU Text STPM Mathematics T (Paper 2)
OpenlySolved Introduction Longman PreU Text STPM Mathematics T (Paper 2)
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Latest: Chapter 25 Solutions ascklee, Jan 30, 2012

Integration
Part of the "Core Books in Advanced Mathematics" Series, by C.T. Moss and C. Plumpton (Macmillan Education, 1983).
Latest: Chapter 11 Solutions ascklee, Feb 6, 2012 
Advanced Level Mathematics: Pure Mathematics 2 & 3
Hugh Neill and Douglas Quadling (2002). This is a hugely popular textbook that is still being reprinted (the latest reprint I have seen is 10th  many books don't even make it to the second reprint!)
Latest: Chapter 3: Exponential and... Man, Aug 30, 2015 
Further Elementary Analysis
This is an old book written by R.I. Porter, and I used it in my sixth form classes. Although it was published way back in 1963, the material is suitable for H2 Mathematics. (Maths will always be maths!)
Latest: Solutions to 15(a,c) ascklee, Apr 26, 2014

U.S. Textbooks
Textbooks published in the United States.