Singapore Math's Primary Mathematics: Common Core Edition Teacher's Guides provide a clear framework for each lesson along with activities that expand and reinforce concepts. Teacher's guides will work for both teachers who wish to adapt lessons to their own classroom situation, and teachers who desire easy-to-follow, effective teaching strategies. Units open with objectives, common core state standards, practices, and prerequisites; notes to the teacher and detailed objectives for each lesson are included to help instructors fully understand the purpose and concept behind each set of problems. Exercises are clearly laid out with detailed instructions on teaching with any textbook page numbers referenced. This teacher's guide contains answers for the textbooks and workbooks; reduced-size student pages with the correct answers overlaid are provided. Books are designed to be taught by classroom teachers using the Primary Math Common Core Edition and are not compatible with other Singapore Primary Math editions. This teacher's edition accompanies the Singapore Primary Mathematics 4B curriculum, for the second semester of Grade 4. 305 pages, spiralbound softcover.