Download or read book Number and Operations with Fractions Leveled Problems: Estimating the Sum written by Anne M. Collins, Ph.D. and published by Teacher Created Materials. This book was released on 2014-07-01 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Differentiate problem solving in your classroom using effective, research-based strategies. This lesson focuses on solving problems related to estimating the sum. The problem-solving mini-lesson guides teachers in how to teach differentiated lessons. The student activity sheet features a problem tiered at three levels.