Elementary Numerical Analysis: Algorithmic Approach by Samuel D. Conte
English | 1 May 1980 | ISBN: 0070124477 | 408 Pages | PDF | 4 MB
This is old but good. It has a similar concept to "Numerical Recipes" by Press, et. al. but covers less ground, and at a more elementary level. Contrary to another reviewer, it does give plenty of examples at an elementary level, which I find quite helpful.