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=Welcome to Mr. O'Brien's 2013-14 Mathematics Classes at [|CHRHS]= = = If you need extra help at any time, just send me an email at media type="custom" key="1022169". Alternatively, parents and students may phone or text my Google Voice number (forwards to my school email): 619-2455.

media type="custom" key="1669721" 

media type="custom" key="1915227" (email me the solution to the Dr. Mike's weekly puzzle for an extra credit IOU)

More math gadgets...

Favorite websites
[__Disclaimer__: As these sites link to other sites that link to other sites that link to other sites, you may be only a couple of clicks away from objectionable material. As with any time you use the internet, please make sure you have discussed proper guidelines with your parent/guardian, and remember how easy it is to close a window if you accidentally end up in an unsavory corner of the internet. If you find anything objectionable, let me know immediately. The above disclaimer applies to any external links on this site.]

[|SAT Question of the Day] From the College Board website.

[|Art of Problem Solving] This is a wonderful site for those who seek greater challenges in math.

[|Online calculator] This online calculator explains its steps- great for mastering order of operations!

[|Math in Movies] Video clips of mathematics in the movies. Let me know if you know a movie that's not listed here!

Harvey Mudd Math Fun Facts Each time you click this link, you will be taken to a different fun math fact!