Reinforce the concepts your students are learning through Singapore Math with math practice and activities. An introduction at the front of the book explains Singapore Math and its common problem types; each unit has learning objects, which clearly define the skills to be learned in that section, and an answer key with step-by-step worked out solutions to help students see how to work the problems. Perfect for students familiar with Singapore Math and for those who just need extra math practice. This Level 3B book covers money; length, mass, & volume; bar graphs; fractions; time; angles, perpendicular & parallel lines; area & perimeter. Three unit reviews, a final review, and challenge questions included.128 pages, softcover. Book Level 3B; Grade 4.