SUBSCRIBE  |  PREFERENCES	MY LINKS:	chat center	STATES  |  GRADE LEVEL  |  SUBJECTS

Brain Compatible Teaching Chatboard TOP POSTS ALL POSTS SUBMIT POST Search Teachers.Net Advanced You're on the... Brain Compatible Teaching Chatboard top posts | all posts | submit post Make Brain Compatible a Favorite! We also recommend... Interest Groups Brain Compatible Teaching Mailring Lesson Plans • Math • Language Arts • Science • Social Studies • Music • Art & Crafts • Phys Ed • Other Teacher Chatboards • latest posts • by subject • by grade level • by state • all chatboards • language arts center • technology center • foreign language center • hot topics • interest groups Teaching Jobs Classroom Projects Teacher Mailrings Teachers.Net Gazette • Current Issue • Harry Wong Column • Teacher Classified Ads • Classroom Printables next post skip topic Print | Share | Report Post Re: Unbelievable Math Problem! Posted by JJ on 1/05/08 This is really cool. I could see some HS math teachers showing this to the kids and having them create the algorithm. My class would enjoy it, but they would think it's "magic!" (Since they are 3rd and 4th graders.) On 11/15/07, Roger Gossen wrote: > On 8/20/05, Dale wrote: >> 1.Grab a calculator.. >> 2.Key in the first three digits of your phone number. >> (Not area code) >> 3.Multiply by 80. >> 4.add 1. >> 5.Multiply by 250. >> 6.Add the last 4 digits of your phone number. >> 7..Add the last 4 digits of your phone number again. >> 8.Subtract 250. >> 9.Divide number by 2. >> 10.Do you recognize the answer? >> >> Please let me know! >> > It's my phone number. > > x = first three digits, y = last four digits > > (80x + 1)x 250 = 20000x + 250 > + y + y - 250 = 20000x + 2y > divided by 2 = 10000x + y which moves first three digits > four places over so that the three digits are in the first > position followed by the last four digits. Pure mathematics! > > Roger Gossen, h.s. math teacher, OK Posts on this thread, including this one Unbelievable Math Problem!, 8/20/05, by Dale. Re: Unbelievable Math Problem!, 8/21/05, by Suzy. Re: Unbelievable Math Problem!, 9/08/05, by Diva. Re: Unbelievable Math Problem!, 9/17/05, by David. Re: Unbelievable Math Problem!, 9/17/05, by David. Re: Unbelievable Math Problem!, 2/01/06, by chanel&ashley. Re: Unbelievable Math Problem!, 2/04/06, by Cute algorithm!. Re: Unbelievable Math Problem!, 2/18/06, by olivia. Re: Unbelievable Math Problem!, 4/04/06, by angel. Re: Unbelievable Math Problem!, 4/08/06, by Sandrx. Re: Unbelievable Math Problem!, 5/01/06, by Brian. Re: Unbelievable Math Problem!, 8/30/06, by Sandrx. Re: Unbelievable Math Problem!, 9/02/06, by pete. Re: Unbelievable Math Problem!, 9/19/06, by kelli. Re: Unbelievable Math Problem!, 3/28/07, by jhony. Re: Unbelievable Math Problem!, 3/29/07, by Shirley. Re: Unbelievable Math Problem!, 4/29/07, by agatha. Re: Unbelievable Math Problem!, 5/31/07, by Me. Re: Unbelievable Math Problem!, 7/19/07, by Michelle. Re: Unbelievable Math Problem!, 9/15/07, by brianna. Re: Unbelievable Math Problem!, 11/15/07, by Roger Gossen. Re: Unbelievable Math Problem!, 11/29/07, by ..... Re: Unbelievable Math Problem!, 1/05/08, by JJ. Re: Unbelievable Math Problem!, 1/26/08, by Steve. Re: Unbelievable Math Problem!, 1/28/08, by jack tawil. Re: Unbelievable Math Problem!, 2/20/08, by lalal. Re: Unbelievable Math Problem!, 6/06/08, by Linda. Re: Unbelievable Math Problem!, 10/14/08, by cheyenne.

Interest Group Center Now connecting teachers with an interest in... Beginning Teachers Student Teachers Substitute Teachers Gifted/Talented Ed Special Education Private School DOD Teachers Counseling Distance Teachers Retired Teachers Classroom Discipline Classroom Management Montessori Method Brain-Compatible Learning Ed Advocacy Current Events Politics Master Teachers No Child Left Behind Teacher Travel Teacher Gatherings Teacher Social Board Teacher Inspirations Classroom Humor Golden Apples Professional Readings Teachers.Net Feedback

Check out our latest FREE Lesson Plans... Reading / Writing Lesson Sheet (1-2,Reading/Writing) posted by Donna () Teaching basic grammar through maps (Middle,Geography) posted by Ezana Habte-Gabr (Colombia) Christmas Tree Pins to Wear - craft (Elementary,Art) posted by Jenna on Teachers.Net Arts & Crafts Chatboard () Rhyming Words/Using Technology (Elementary,Reading/Writing) posted by Lauren Checkeroski (US) Analyze and Interpret past historical events - Presidents (Middle,Social Studies) posted by Kathleen Abair () “Rise and Sell: The Energy Drink Business and What They're R (Senior,4 Blocks) posted by Jenifer Jones () "A Pair of Stockings" and Reader Response (Senior,) posted by Carpenter, Filipkowski, Hayes, Jones () "A Pair of Stockings" and Reader Response (Senior,Literature) posted by Jenifer Jones () metric system (Middle,Mathematics) posted by daineacia payne (detroit, usa) Area of Triangles (Senior,Mathematics) posted by Cornelia Taran (Pontiac,MI) The Five Senses (Elementary,Science) posted by Ban Atto (Detroit, USA) Alphabet sounds (Kindergarten,Language) posted by Melissa (Detroit, Michigan) Honest Abe (Elementary,Reading/Writing) posted by Maribeth () Ugly as a Toad + more idioms (all,Language) posted by Kelly Myer () Exploring Native American Tribes (Elementary,Social Studies) posted by Kristi McGrath (Dearborn Heights, United States) Light Years Away (Elementary,Science) posted by Ms. Mary Arbanas (GP, United States) Pythagorean Theorem (Middle,Mathematics) posted by Cristina Fusco (Detroit, MI) Pythagorean Theorem (Middle,Mathematics) posted by Cristina (detroit, mi) Build Motivation, Stop Apathy and Boredom, Motivate Students (all,other) posted by Ruth Wells (US) Motivation, Attendance Punctuality: What You Miss (all,other) posted by Ruth Wells (US) Anger and Temper Control Truth Test (all,other) posted by Ruth Wells (US) We're All Special Ed in Something (all,other) posted by Ruth Wells (US) We're All Special Ed in Something (all,other) posted by Ruth Wells (US)

Web Teachers.Net

Site Map: Jump to... --------- Chatboards Lesson Plans Project Center Classified Ads Teaching Jobs Chatrooms Meetings Mailrings ** Forums ** Teacher Chatboard Administrators Grade Levels State Teachers Professional Groups GRADE LEVELS Chilcare Pre-School(EC) Kindergarten Primary Elem Upper Elem Middle School High School College Profs Multiage Adult Education SUBJECT AREAS Math Teachers English Teachers Science Teachers Social Studies Music Teachers Art Education Health Education PE/Coaching Language Teachers ENGLISH CENTER Reading/Writing HS English Books & Liter Remedial Reading Accel Reader 4Blocks Lit Bldg Blocks(K) 6Traits Writing Read Across Amer Librarians Book Talk Reading First LANGUAGE CENTER French Teachers German Teachers Spanish Teachers EFL/ESL Sign Language Study Abroad PROF GROUPS Master Teachers Begin Teachers Student Teachers Subst Teachers Gifted/Talented Special Educ Private School DOD Teachers Counseling Distance Teachers Retired Teachers TEACHING METHODS Discipline Classroom Mgmt Montessori Brain-Compatible HOT TOPICS NCLB Ed Advocacy Current Events Politics Teacher Travel Gatherings Social Chatboard Inspirations School Humor Golden Apples Prof Reading T-Net Feedback PROJECT CENTER Project Switchbd Arts & Crafts Classroom Centers Family Math Fieldtrips Grant Writing Fundraising Earth Day 100 Days Traveling Buddies Classroom Pets Pen Pals Postcard Projects TECH CENTER Computer Teachers Internet Security Web Authors Ed Software Apple/Mac Media Spec/Lib Tech Coordinators CAREER CENTER Teaching Jobs Cont Education Teacher Recruiters Jobhunters Natl Bds/NBPTS Tutors STATE TEACHERS AL Teachers AK Teachers AZ Teachers AR Teachers CA Teachers CO Teachers CT Teachers DE Teachers FL Teachers GA Teachers HI Teachers ID Teachers IL Teachers IN Teachers IA Teachers KS Teachers KY Teachers LA Teachers ME Teachers MD Teachers MA Teachers MI Teachers MN Teachers MS Teachers MO Teachers MT Teachers NE Teachers NV Teachers NH Teachers NJ Teachers NM Teachers NY Teachers NC Teachers ND Teachers OH Teachers OK Teachers OR Teachers PA Teachers RI Teachers SC Teachers SD Teachers TN Teachers TX Teachers UT Teachers VT Teachers VA Teachers DC Teachers WA Teachers WV Teachers WI Teachers WY Teachers -- Teachers Abroad AU/NZ Teachers Canadian Teachers UK Teachers ** CLASSIFIED ADS ** Tutors Help Wanted Books for Sale For Sale (Misc) Classroom Supplies Items Wanted Fundraising Tutors Wanted Teacher Created Computers Educational Software Educational Games Continuing Education Distance Learning Manipulatives

Home

Search

Teaching Jobs

Classifieds

Lessons

Contacts

PR

Advertise

© 1996 - 2008. All Rights Reserved. Please review our Terms of Use, Mission Statement, and Privacy Policy.