Math Goodies is a free math help portal for students, teachers, and parents.
|
Interactive Math Goodies Software

testing left nav
Math Forums @ Math Goodies
Home | Profile | Register | Active Topics | Members | Search | FAQ
 All Forums  New Visitor Forum  Testing Forum  tricks. New Topic  Reply to Topic  Printer Friendly
Author  Topic

ever22
Junior Member

United Kingdom
3 Posts

 Posted - 05/12/2012 :  16:43:37 Does anyone know any mathematical tricks for multiplying two digit number by three digit number mentally

Tessa
Average Member

USA
14 Posts

 Posted - 06/03/2012 :  05:10:34 hello ever22! I hope that this might help you!Multiply right-most digits of both the numbers and write down the ones; carry, if any. (e.g smiley face for where you're meant to multiply)??x?Multiply the:right digit of 2nd number with middle digit of 1st number.left digit of 2nd number with right digit of 1st number.Add both the results together plus carried digit; write down the ones and carry.Multiply the right digit of 2nd number with left digit of 1st number.left digit of 2nd number with middle digit of 1st number.Add the results together plus carried digit; write down the ones and carry.Multiply left-most digits of both the numbers and add carried digit; write it down.Good luck! I'm sorry if it is a little confusing! I would put in pictures to help if I could but....
Topic
 New Topic  Reply to Topic  Printer Friendly Jump To: Select Forum New Visitor Forum       Testing Forum Homework Help Forums       Basic Math and Pre-Algebra       Algebra       Geometry and Trigonometry       Pre-Calculus and Calculus       Probability and Statistics       Standardized Test Preparation Help       Miscellaneous Math Topics Educator Forum       Teacher Talk Parent Forum       Parent's Place  -------------------- Home Active Topics Frequently Asked Questions Member Information Search Page
 Math Forums @ Math Goodies © 2000-2004 Snitz Communications