Seriously Addictive Mathematics, or SAM, Katy began accepting students Jan. 15 and held a grand opening Feb. 1 at 25920 Westheimer Parkway, Ste. 200, Katy, owner and tutor Nina Chatterjee said. The business offers tutoring in English and math for children in first through eighth grades. In particular, SAM specializes in teaching Singapore math, which is a model Katy ISD uses, Chatterjee said. 346-307-5171. www.samkaty.com