UPDATED with 150 additional math problems Our CCLS (Common Core Learning Standards) series for 3rd Grade Mathematics version prepares students throughout District of Columbia for the required Common Core Standards to test students' math proficiency. The emphasis is on representing and solving problems involving multiplication and division; understanding properties of multiplication and the relationship between multiplication and division; multiplying and dividing within 100; solving problems involving the four operations, and identify and explain patterns in arithmetic; using place value understanding and properties of operations to perform multi-digit arithmetic; developing understanding of fractions as numbers; solving problems involving measurement and estimation; representing and interpreting data; and reasoning with shapes and their attributes. These standards are covered extensively by the practice problems. This book contains over 350 practice problems aligned to each Common Core Learning Standard. In addition the book contains an answer key to practice problems.