Download or read book Number Sense Leveled Problem: Add and Subtract At the Farm written by Linda Dacey, Ed.D. and published by Teacher Created Materials. This book was released on 2014-01-01 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Differentiate problem solving in your classroom using effective, research-based strategies. The problem-solving mini-lesson guides teachers in how to teach differentiated lessons. The student activity sheet features a problem tiered at three levels.