Each unit has learning objectives, which clearly define the skills to be learned in that section, and an answer key with worked out solutions that help students see how to work the problems. Many students struggle with word problems. To help overcome this struggle, these workbooks focus on diagrams, number bonds, the "counting on" method, and the "crossing out" method to help students master challenging word problems as well as exercise mental calculation. Features one problem per page and step-by-step solutions in the answer key. Perfect as a supplement to classroom work or as a homeschool resource, this series will boost confidence in problem-solving and critical-thinking skills.