Teaching Mathematics In Elementary And Middle School - 400 Pages With Bonus CD This book embraces active mathematics instruction and the development of mathematical thinking through problem solving. Thanks for looking. Frequently Asked Questions Do you combine shipping on multiple items? Yes any number of items purchased together will be shipped together for one low price. Just let us know you plan on purchasing multiple items. What is the best way to contact you? Please use eBay messages. If you do not receive a reply within one (1) business day, please resend the message. Where is my invoice? Invoices are sent out once a day usually first thing in the morning.. When is payment due? Payment is due within 7 days. What is your return policy? 14-days money back, no questions asked.