Answer by MobySnoodles · Mar 30, 2013 at 06:43 PM
Answer by Denise Gaskins · Mar 31, 2013 at 05:54 PM
Answer by yelenam · Mar 31, 2013 at 10:53 PM
Answer by yelenam · May 06, 2013 at 07:19 PM
Answer by Lobr23 · Jul 31, 2013 at 12:25 AM
Answer by sherylmorris · Jan 31, 2014 at 05:55 PM
See Google Images "Montessori Addition" and "Montessori Multiplication" for my answer.